What is Pathological Demand Avoidance (PDA)?

Pathological Demand Avoidance (PDA) is a proposed profile, strongly associated with autism, in which everyday demands can trigger substantial distress and a strong need to preserve autonomy or control. PDA is not a separate diagnosis. Anxiety, uncertainty and loss of autonomy may contribute to avoidance, which can look like defiance from the outside.

Key takeaways

• PDA describes substantial difficulty responding to everyday demands, often accompanied by distress and a strong need for autonomy or control.
• It is not a standalone diagnosis, and research has not established PDA as a distinct subtype of autism.
• Demands may be direct, hidden within everyday interactions, or experienced internally through bodily needs and self-imposed expectations.
• Anxiety and uncertainty are important, but sensory experiences, executive functioning, fatigue and current capacity may also contribute.
• Support generally focuses on understanding what makes demands difficult, reducing unnecessary pressure, preserving agency and adapting support to the individual.

What is pathological demand avoidance (PDA)?

Pathological Demand Avoidance, usually shortened to PDA, describes a pattern in which everyday demands and expectations can cause substantial distress and a strong need to avoid, delay or regain control over what is being asked. The term was introduced by developmental psychologist Professor Elizabeth Newson, who described autistic children who showed unusually persistent resistance to ordinary demands and used a range of strategies to avoid them [1,2].

PDA is more than occasionally not wanting to do something. A person with a PDA profile may have genuine difficulty responding to a demand even when they have the skills to do it, have done it before, had already planned to do it, or would normally enjoy it. What appears externally as refusal or non-compliance may therefore reflect substantial difficulty responding to the demand, which helps explain why something manageable yesterday may feel impossible today.

Demand avoidance can look very different from one situation to another. A person might procrastinate, negotiate, change the subject, use humour, give practical or creative reasons why they cannot do something or try to create more time before responding. These kinds of socially strategic responses have been described in PDA research [2,11]. When refusal to comply and distress increases, the person may withdraw, shut down, experience a meltdown or become unable to respond to the demand.

Anxiety and intolerance of uncertainty are associated with greater demand avoidance, and many people describe distress when they feel they are losing control, do not know what will happen next, or experience a threat to their autonomy. These factors appear important, but research has not established one single or simple cause of PDA [3,4].

A person may also experience expectations, situations or signals from their own body as demands. Needing to eat because they are hungry, go to the toilet, fall asleep or complete something they had already decided to do can all create pressure to respond. Understanding PDA therefore involves looking beyond whether someone is simply willing to “comply”.

PDA has been studied most extensively in autistic children and teenagers, with growing research involving adults. Its precise relationship with autism and other conditions is still debated. At present, it is most accurately described as a profile of demand-related difficulties rather than a separate established diagnosis or confirmed subtype of autism [5,6].

How common is PDA?

We do not yet know how common PDA is. Studies have reported very different figures because PDA is not a formally recognised diagnosis and researchers have used different definitions, measures and thresholds to identify the profile.

One of the few population-based studies looked at 15 to 24-year-olds in the Faroe Islands in the North Atlantic. Gillberg and colleagues (2015) found that 0.18% of the total population had both autism and indications of a possible PDA profile in childhood. Among the autistic participants assessed for PDA, around one in five showed indications of the profile. The study was relatively small, so these figures should not be assumed to apply to other populations [7].

Much higher figures have been reported in specialist services. One UK autism clinic identified a PDA profile in 47% of 136 autistic children assessed there. However, the clinic was known for its expertise in PDA and received many referrals where PDA was already suspected, so the 47% figure cannot be used to estimate how common PDA is in the wider autistic or general population [8].

A 2026 systematic review found substantial variation in how PDA had been identified across studies, including differences in assessment tools and thresholds [9]. Clinicians are also increasingly recognising PDA profiles in autistic people, and more parents are seeking assessment or confirmation for their child, but increased recognition does not tell us whether PDA itself is becoming more common.
There is currently no reliable population estimate of PDA prevalence. Larger studies using clearer and more consistent criteria are needed before we can answer that question with confidence.

Where did the term PDA come from, and why is it debated?

PDA most commonly stands for Pathological Demand Avoidance. Developmental psychologist Professor Elizabeth Newson introduced the term in Nottingham, England, in the 1980s after observing children referred for developmental assessment. Many shared characteristics with autism but did not fit neatly within descriptions of autism used at that time, and one characteristic that stood out was their unusually persistent difficulty responding to the ordinary demands of everyday life.

Newson and colleagues published their clinical description of pathological demand avoidance syndrome in 2003 and proposed that it represented a distinct presentation within the broader group of developmental conditions recognised at that time [1]. Autism terminology and our understanding of PDA have changed considerably since then.

Debate has focused particularly on the word “pathological”. Some autistic people, families and clinicians feel that it presents the person's response to demands as inherently disordered or defective. Moore (2020), writing from a critical autism studies perspective, argued that the label can pathologise autistic children's resistance and agency, including responses that may be understandable in the context of overwhelming or distressing demands. PDA Society guidance also reports that Newson herself later expressed regret about the term [10]. Others feel that “pathological” communicates just how pervasive and disabling their difficulty responding to demands can be.

Alternative terms reflect different ways of understanding the profile. Extreme Demand Avoidance (EDA) appears in some research and clinical literature, while other descriptions include pervasive demand avoidance or simply a demand-avoidant profile. Within parts of the PDA community, PDA has also been reframed as Pervasive Drive for Autonomy or Persistent Drive for Autonomy, placing greater emphasis on autonomy, agency and control rather than only on observable avoidance.
We have also begun exploring the term Demand Dysphoria (DD). By dysphoria, we mean significant distress that is difficult to endure. The term is intended to shift attention from what someone appears to be doing, such as refusing or resisting, towards the intense distress a demand may create and that may lead to avoidance. Demand Dysphoria is a proposed way of understanding and describing this experience, rather than an established clinical or research term.

Because there is no universally accepted alternative to Pathological Demand Avoidance, we use PDA throughout this article while recognising that people may prefer different terminology. Having language for the experience can still be valuable, helping individuals and families move beyond interpretations of deliberate non-compliance or poor parenting towards understanding support needs, communicating those needs to others, and identifying strategies that may reduce distress.

Is PDA part of autism?

PDA has a strong historical connection with autism, but researchers have not agreed on exactly how the two are related. Elizabeth Newson originally identified the profile in children referred for developmental assessment, many of whom would now be understood as autistic. She later argued that PDA was a distinct presentation within the autism spectrum, and much of the research since then has focused on autistic children or children being assessed for autism. This history is why PDA is often described as a “PDA profile of autism”, although current research has not established it as a distinct subtype of autism.

Studies have found high levels of autistic characteristics among children identified as having a PDA profile. O'Nions and her colleagues, for example, studied a group of children with substantial PDA characteristics and found that almost all also met criteria for autism. However, many participants in PDA research have been recruited through autism services or were already suspected of being autistic, making it difficult to know whether PDA occurs only within autism or whether a similar profile may also occur in people who are not autistic [5,11].

Research reviews have also identified problems with how PDA has been studied. Different studies have used different definitions and methods of identification, many have relied heavily on parent reports, and possible alternative explanations for demand avoidance have not always been explored. A 2026 systematic review found considerable variation in how PDA was identified and judged all included diagnostic studies to have important methodological limitations [9].

PDA is not listed as a separate diagnosis in the DSM-5-TR or ICD-11, so there are no internationally agreed diagnostic criteria or standalone PDA diagnosis within these systems. This does not make a person's difficulties with demands, distress or need for autonomy any less important. These experiences can still be explored during an autism or broader neurodevelopmental assessment, and some clinicians describe an autistic person as having a PDA profile, although there is not yet a standardised way of identifying it.

At present, the most accurate description is that PDA is a proposed profile strongly associated with autism, while its exact relationship with autism remains unresolved [5,12].

Can you have PDA without autism?

Demand avoidance can certainly occur without autism. Whether the specific profile described as PDA can occur independently of autism is less clear.
Avoiding demands is not unique to PDA. A person may find everyday demands difficult because of anxiety, depression, trauma, ADHD, exhaustion, executive-function difficulties or other factors, so experiencing demand avoidance does not by itself mean that someone has a PDA profile.

Most PDA research has focused on autistic children and adolescents, so we know much less about whether the same profile occurs in people with other neurodevelopmental conditions. A 2021 systematic review found no cross-sectional or qualitative studies specifically investigating PDA in children with other neurodevelopmental conditions [5], although it did include a small case-study report involving children with epilepsy.

In that study, four children with epilepsy showed substantial PDA characteristics. All four also had ADHD and cognitive impairment, while three met criteria for autism [13]. These cases suggest that substantial demand-avoidant characteristics may also be seen in children who do not meet criteria for autism, but such a small number cannot tell us whether PDA represents a distinct profile outside autism.

Research has expanded since the 2021 review, including studies of autistic adults, families and professionals, but it has still largely focused on PDA in the context of autism rather than directly comparing the profile across different neurodevelopmental conditions.

For clinicians, the more useful question is often what is contributing to this person's difficulty with demands? A comprehensive assessment should consider autism alongside anxiety, ADHD, trauma, mood, executive functioning, communication and language, the person's broader developmental profile, and their environmental context.

What is a demand in PDA?

When discussing demand avoidance, a demand can mean much more than being directly told to do something.

An obvious demand might be “Put your shoes on” or “It is time to leave”. However, people with a PDA profile may also experience expectations, choices, praise, transitions or bodily needs as demands. This helps explain why simply “reducing demands” does not always reduce distress because some of the pressures affecting the person may be much less obvious.

The difficulty may not be with the activity itself. A person may have the skills, want to participate, or have already decided to do something. The difficulty can emerge when it becomes something they feel they have to do.

One adult participant in Kenny and Doyle’s (2024) study described how this affected things they valued:

“Everything I have loved over the years has slipped away from me. They are all demands that I cannot cope with.” (p. 8)

This shows how demand avoidance can affect enjoyable and personally meaningful activities, not only chores or responsibilities.

Direct demands

Getting dressed, leaving home, completing schoolwork and attending appointments all involve expectations to act. For a parent, “Put your shoes on” may seem like one small step towards an enjoyable outing, while for their child the instruction may create pressure that makes getting ready harder.

A demand is defined partly by how it is experienced, not simply by how it was intended.

Hidden demands

Research and lived-experience accounts suggest that demands may also be hidden within ordinary interactions. Transitions, expectations and even receiving praise have been described as possible demands for some children with a PDA profile.

Praise can create an expectation to repeat a behaviour. “You got dressed all by yourself today!” may leave a child feeling that they must now manage it independently every day.

Rewards can add pressure by making something desirable depend on completing a task. “Once you finish your homework, you can use the tablet” introduces another expectation. Parents in Nawaz and Speer’s (2025) study described reward-based approaches as ineffective or counterproductive for their children because they added expectations around performance. These were parents’ experiences, rather than findings from a trial of rewards.

Assumptions may communicate that someone else has decided how a child should feel. “I know you’ll love this party” can create pressure to enjoy it.

Choices can carry demands too. “Would you like A or B?” still requires a decision, which may be difficult when the person is already overwhelmed.

An instruction can also change something the person had already planned to do. A child might be about to pick up a book, then feel unable to continue when someone says, “Time to do your reading.” What had been self-directed has suddenly become an expectation.

An adult participant in Saddik and Mason’s (2026) study described a similar shift when an activity became externally required:

“the moment it’s tied to a deadline or grade, I freeze” (p. 8)

Internal demands

Some demands may come from bodily needs or expectations we place on ourselves. Hunger can bring the need to eat; thirst, the need to drink; a full bladder, the need to use the toilet. Tiredness may bring pressure to sleep. A personal plan can also become an expectation: I said I would do this today.

Lived-experience and clinical accounts describe these needs as sometimes feeling demanding in themselves. However, research has not yet directly established how bodily signals become experienced as demands in PDA.

Recognising direct, hidden and internal demands can help parents make sense of apparent inconsistencies. Something a person enjoyed yesterday may feel difficult today because the expectations around it, the way the demand is presented, or their capacity to respond have changed.

Why anxiety can look like defiance in PDA

When a child avoids a request, argues, walks away or refuses to continue, it can look as though they are deliberately being difficult. What is harder to see is the anxiety, uncertainty or overwhelm that may be behind their response. Understanding demand avoidance means looking beyond what the person does and considering what the demand may feel like for them.

Even an everyday request can introduce uncertainty: What exactly am I being asked to do? What happens next? Can I stop if it becomes too much? Having some choice or control can make a situation feel more predictable, while a demand that removes that sense of autonomy may make something manageable suddenly much harder.

Stuart and colleagues (2020) found that children and adolescents with greater anxiety and difficulty coping with uncertainty also showed more demand-avoidant behaviours [3]. They suggested that gaining control may help make an uncertain situation feel more predictable. Anxiety and uncertainty explained only part of the differences in demand avoidance, so they are likely to be part of the picture rather than the whole explanation.

Adult research has also found associations between demand avoidance, anxiety, difficulty managing uncertainty and autistic characteristics [4,14,32], while autistic adults have emphasised autonomy, trust, safety and flexibility [6]. For a parent, this may help explain why repeated reminders to get ready increase pressure even when they are intended to help. The child may already know what needs to happen but be struggling to respond while anxious, overwhelmed or unable to regain a sense of control. Read more about PDA and anxiety in autistic adults.

As distress increases, some people may withdraw, shut down or experience a meltdown. These responses are better understood as possible signs of overwhelm than simply as behaviour intended to oppose someone [27]. A recent theoretical paper has also proposed an autonomic threat-response framework, in which escalating demand-related distress may shift from attempts to negotiate or regain control towards fight, flight or freeze (shutdown) responses. This remains a proposed framework rather than a validated PDA mechanism [28].

Anxiety does not explain every instance of demand avoidance. Rai and colleagues (2026) found that sensory reactivity was associated with greater demand avoidance in autistic children and adolescents identified with PDA, even after accounting for anxiety and autistic characteristics. Tactile, taste and smell sensitivities, and sensory-seeking patterns were particularly associated with demand avoidance in this group [32]. Executive-function difficulties, previous experiences, trauma, fatigue and the person's capacity at that time may also contribute [5,30,32].

Asking “What is making this difficult right now?” can shift the focus from judging the behaviour to understanding what may be contributing to it. PDA-related demand avoidance can also look similar to Oppositional Defiant Disorder (ODD) from the outside, but the broader pattern and what appears to be contributing to the behaviour matter. Read more about differentiating PDA from ODD.

Executive function and PDA

Executive function helps us get started, organise what we need to do, manage time, shift between tasks, hold information in mind and follow something through to completion.

Executive-function differences are common in both autism and ADHD, although they vary a lot between people. They can be especially relevant for autistic people who also have ADHD, sometimes referred to as AuDHD. Research suggests that autistic people with ADHD can experience substantial executive-function difficulties in everyday life [15].

Executive functioning may also contribute to demand avoidance, although research specifically examining this in PDA is still limited. Preliminary research with autistic children has found an association between parent-reported executive-function difficulties and PDA characteristics [16].

A person can know exactly what they need to do and still have difficulty starting. They may understand that they need to shower, answer an email, begin an assignment or leave the house, and genuinely intend to do it, but still feel unable to get going or shift from what they are already doing.

A task that was manageable yesterday may feel much harder today if the person is also dealing with anxiety, sensory demands, fatigue, competing tasks or multiple decisions. Executive-function difficulties may add to the pressure of a demand rather than being the sole reason for avoiding it.

What looks like procrastination or unwillingness may therefore reflect difficulty initiating, organising or shifting attention. It can be more helpful to ask “What is making it hard to get started right now?” than to assume the person simply does not want to do it.

Executive function is likely to be one part of the picture for some people with PDA, particularly where autism and ADHD co-occur. Current research does not establish executive dysfunction as a defining feature or cause of PDA, but it may help explain why responding to demands can become harder at some times than others.

How PDA can present across the lifespan

Demand avoidance may be experienced from childhood into adulthood, although what it looks like can change as the demands, expectations and environments in a person's life change. Most PDA research has focused on children and adolescents, so we know less about adults and about how the profile changes over time [17].

PDA in children

For children, difficulties may arise around everyday expectations such as getting dressed, completing self-care, leaving the house, moving between activities or responding to requests. A child may delay, negotiate, distract, withdraw or become increasingly distressed when they are struggling to respond to a demand.

Some children may appear sociable, humorous and verbally capable and use conversation, distraction or negotiation to navigate demands, while others may show their distress more visibly through withdrawal, shutdowns or meltdowns.

A school day brings many demands together. Children need to arrive at a particular time, move between activities, follow instructions, complete learning tasks, manage social interactions and cope with sensory experiences such as noise, lighting and crowded spaces. For some children with a PDA profile, these demands can build across the day or week until their functional capacity reduces. Research has described substantial difficulties accessing or remaining in suitable education among children and adolescents with pronounced demand avoidance, although experiences vary considerably between individuals [18,19]. Read more about PDA and school can't.

PDA in teenagers

Adolescence can bring additional demands around secondary school, deadlines, changing classrooms and teachers, friendships, independence and planning for further education or work. Young people may also be expected to manage more of these demands without adult support.

Research has not identified one predictable way that PDA changes during adolescence. Most studies have grouped children and adolescents together, so we cannot say that demand avoidance generally becomes stronger or weaker during the teenage years. Anxiety, uncertainty and autonomy may remain important, but functional capacity and the way distress is expressed can vary considerably between young people [3].

PDA in adults

Newson's follow-up of 18 young adults found varied outcomes. Demand avoidance remained at a similar level for some participants, decreased for others and increased for a smaller number [1].

More recent adult research describes difficulties with demands across daily living, relationships, education and employment. Autistic adults have also described pervasive anxiety and emphasised the importance of autonomy, trust, safety and flexibility [6]. Some adults may develop ways of structuring their lives to reduce unnecessary demands or gain greater control over how and when things are done, for example, being self-employed or on a short-term contract.

A person's functional capacity, environment, support, anxiety, executive functioning and the demands they are managing may all influence what demand avoidance looks like at different ages, and current research does not support one single lifespan pathway.

Read more about PDA in autistic adults.

The impact of PDA on the person and their family

Persistent demand-related distress can affect much more than whether a particular task gets completed. Everyday activities involving self-care, education, relationships, appointments or work may require substantial emotional and cognitive effort. Research has found high levels of emotional distress among children described as having a PDA profile, while adult research describes anxiety, isolation and difficulty managing everyday demands across home, study and work [6,11].

Demand avoidance can also lead to missed experiences and opportunities. Tony has described this in relation to his son, Will. When Will was younger, suggestions such as trying soccer or martial arts were often met with an immediate refusal. Looking back, Tony wondered whether the demand created by the suggestion itself had made those activities difficult to consider. Will now also regrets some of those missed opportunities. This illustrates how demand avoidance may sometimes narrow a person's experiences, even when the activity itself could have been enjoyable or meaningful.

Parents may spend considerable time working out what their child can manage, reducing distress, negotiating everyday activities and advocating for appropriate support. In qualitative research, parents have described exhaustion, isolation, judgement from others and difficulty maintaining friendships or attending to their own needs [20,27,29]. Curtis and Izett also found that some mothers struggled to balance their child's support needs with those of siblings and partners, particularly when needs were substantial or unpredictable. Parents may also differ in how they respond to demand avoidance, with one parent favouring more traditional discipline or expectations while the other focuses more on reducing pressure and understanding what is contributing to the child's distress.

When professionals misunderstand demand-related distress, parents may feel blamed or judged for their child's behaviour or for the ways they have adapted their parenting. Poorly matched support can increase stress for both the child and family rather than helping to reduce it [20,21].

At school, repeated expectations, transitions, sensory experiences and social demands may contribute to difficulties with attendance or participation. In adulthood, similar pressures can arise through self-care, deadlines, workplace expectations, relationships and the need to maintain enough capacity for everyday life [6]. Across these settings, repeated distress, missed opportunities, misunderstanding and the effort involved in managing everyday demands can shape daily life for the person and for those supporting them.

How is PDA identified?

PDA is not currently a standalone diagnosis in the DSM-5-TR or ICD-11, and there is no single agreed test for identifying it. Demand-avoidant characteristics may instead be explored as part of a broader assessment of the person's neurodevelopmental profile, experiences and support needs.

Assessment may consider how the person responds to everyday expectations, anxiety and uncertainty, their need for autonomy and control, executive functioning, sensory experiences, social communication, ADHD characteristics, trauma and other factors that may be contributing to their difficulty with demands.

Several research tools have been developed to help describe these characteristics. The Extreme Demand Avoidance Questionnaire (EDA-Q) is a 26-item parent-report measure for children and adolescents, and an adult self-report version, the EDA-QA, was developed later. These tools can help identify patterns associated with extreme demand avoidance, but they are not diagnostic tests [22,23].

PDA-related characteristics have also been explored within the Diagnostic Interview for Social and Communication Disorders (DISCO) [2]. Studies have not used these tools consistently, and a 2026 systematic review found differences in the measures used, the cut-off scores applied and how researchers decided whether someone met criteria for a PDA profile. This makes studies harder to compare and limits how confidently their findings can be interpreted [9].

For someone seeking an assessment, it may be helpful to find a clinician experienced in autism and broader neurodevelopmental assessment who is also familiar with demand avoidance. The aim is to understand the person's individual profile, what may be contributing to their difficulties, and what support may help.

Read more about assessment and support for PDA.

What can help with PDA?

There is no single approach that works for every person with a PDA profile. Research evaluating PDA-specific interventions is still limited, so current approaches draw on emerging research, clinical experience and the lived experience of autistic people and families. Support starts with understanding what is making a demand difficult for this person, rather than focusing first on how to gain compliance [27].

A qualitative study of practising psychologists described support that commonly focused on reducing stress, matching demands to the child's capacity, increasing autonomy, using less directive communication and adapting the environment around the child. These were clinicians' reported approaches rather than tested PDA interventions [27].

Start with autonomy, capacity and trust

When demands are associated with anxiety, uncertainty or loss of autonomy, increasing pressure may make it harder for the person to respond. It can help to consider which demands are necessary, which can be reduced or delayed, and where the person can have meaningful control over what happens, when it happens and how it happens.

Choice also needs to be genuine. Offering two options when both lead to an outcome already decided by someone else may still feel like pressure, and for some people being required to choose can itself become another demand. Adult lived-experience research has particularly emphasised autonomy, flexibility, trust and safety as important aspects of support [6].

Change how demands are communicated

The way an expectation is communicated can change how much pressure it creates. A direct instruction such as “Put your shoes on now” may be harder to respond to than information such as “Your shoes are by the door” or “We are leaving in ten minutes.” This is sometimes described as using declarative rather than imperative language.

Other approaches may include wondering aloud, allowing extra processing time, using humour where appropriate, breaking tasks into smaller steps or inviting the person to work through a problem collaboratively. The aim is not to disguise a demand or trick someone into complying, but to reduce unnecessary pressure while preserving the person's agency.

What about discipline and boundaries?

Parents may search for “how to discipline a child with PDA” after repeated instructions, rewards, consequences or greater firmness have not helped.

A low-demand approach does not mean having no boundaries. Safety still matters, and children still need support to participate in family and community life. The difference is in how difficulties are understood and responded to. Instead of asking “How do I make my child comply?”, it can be more useful to ask “What is making this expectation difficult, and what might help them manage it?”

When a child is already highly distressed, punishment is unlikely to address whatever has made the situation difficult. Collaborative problem-solving approaches instead consider the child's concerns, the adult's concerns and possible solutions that address both. Collaborative and Proactive Solutions (CPS) has an evidence base for young people with oppositional or challenging behaviour, although it has not been specifically validated as a PDA intervention [24,25].

At home

At home, support may involve reducing non-essential demands, allowing recovery time, accommodating sensory needs, preparing collaboratively for necessary activities and recognising that capacity can change from day to day. An expectation may still matter, but how, when and under what conditions it is approached can influence whether the person is able to respond.

At school

Similar principles can be applied at school by reducing unnecessary pressure, providing meaningful choice, adapting communication and transitions, addressing sensory and social stressors, and prioritising trusting relationships with key adults [32]. Expectations may remain, but the way a student is supported to meet them may need to be flexible.

Because current PDA research does not support one prescribed programme or set of strategies for everyone, support should be individualised. An approach that reduces pressure for one person may increase it for another, so support needs to be developed collaboratively and reviewed according to whether it reduces distress and supports sustainable participation in everyday life.

What does the research tell us about PDA?

Research into PDA has grown considerably since Elizabeth Newson's original clinical descriptions, but it is still a relatively small field and some fundamental questions remain unanswered.

Studies have repeatedly identified pronounced difficulty responding to everyday demands and found associations between demand avoidance and autism, anxiety, intolerance of uncertainty, ADHD characteristics and sensory experiences. Qualitative research has also described substantial effects on education, relationships, family life and managing everyday activities. More recent research has begun to include adults through both lived-experience studies and quantitative research examining demand-avoidance characteristics in the general population [4,5,6,32].

There are still important limitations in the PDA evidence base. Studies have used different definitions of PDA, questionnaires, cut-off scores and ways of deciding who fits the profile. Many have also involved small or highly selected groups of participants or relied heavily on parent-report measures [5,17].

A 2026 systematic review of research into how PDA is identified found only 12 studies that met its criteria. Nine involved children, two involved adults and one included both. Researchers had used PDA measures in different ways, and every study had design limitations that reduced confidence in the findings. The review concluded that the available evidence does not yet adequately validate these tools for diagnosing PDA [9].

Larger and more representative studies are still needed to understand how common PDA is, how it changes across the lifespan, adults' experiences and long-term outcomes, and how demand avoidance relates to autism, ADHD, anxiety, executive functioning, trauma, sensory experiences and a person's environment. We also know very little about which forms of support are most effective. Many approaches currently used with PDA are informed by clinical experience, practice guidance and lived experience rather than trials showing that a particular intervention improves outcomes.

These gaps in the research do not make demand-related distress any less real. They mean we need to be clear about the difference between what people describe experiencing, what research currently suggests may contribute to those experiences, and what has not yet been established.

For practitioners wanting to explore PDA assessment, formulation and support in greater depth, our PDA and Autism: Going Deeper professional webcasts examine current research alongside clinical approaches for working with children, teenagers and adults.

Common questions about PDA

Is PDA a form of autism?

PDA is strongly associated with autism and is often described as a PDA profile of autism. However, research has not established PDA as a distinct subtype of autism. Most PDA research has involved autistic people, and its exact relationship with autism remains an area of ongoing research.

Can you have PDA without autism?

Demand avoidance can certainly occur without autism. People may find demands difficult because of anxiety, ADHD, trauma, depression, executive-function difficulties or other factors. Whether the more specific profile described as PDA occurs independently of autism is less clear, because most PDA research has involved autistic children and adults.

Is PDA an official diagnosis?

No. PDA is not a standalone diagnosis in the DSM-5-TR or ICD-11, and there are no internationally agreed diagnostic criteria. Some clinicians identify or describe a PDA profile during autism or broader neurodevelopmental assessment but approaches to identifying the profile currently vary.

What is the difference between demand avoidance and PDA?

Demand avoidance is a broad description of difficulty responding to demands and can occur for many reasons. PDA describes a more pervasive proposed profile in which ordinary demands may create substantial distress and a strong need to regain autonomy or control. Demand avoidance alone does not mean that someone has a PDA profile.

Is it PDA or ADHD?

PDA and ADHD can overlap, and some autistic people with a PDA profile also have ADHD. Executive-function difficulties associated with ADHD may make starting, organising or shifting between tasks harder, while PDA describes a broader pattern of demand-related distress and avoidance. Assessment should consider both rather than assuming the difficulties must be one or the other. Read more about understanding AuDHD and its strengths.

How is PDA different from Oppositional Defiant Disorder?

PDA and Oppositional Defiant Disorder (ODD) can look similar from the outside because both may involve refusing requests, arguing or becoming distressed around expectations. PDA research places greater emphasis on demand-related distress, anxiety, uncertainty and autonomy, but the evidence is still developing. Careful assessment needs to consider the person's broader presentation rather than relying on behaviour alone. Read more about PDA vs ODD and how they differ.

Does PDA get better with age?

There is no single pattern. Some people experience less demand avoidance as they get older, while others continue to have substantial difficulties into adulthood. Changes in environment, autonomy, support, anxiety, executive functioning and the demands placed on the person may all affect what PDA looks like across different stages of life.

How common is PDA?

We do not currently know. Studies have produced very different figures because researchers have used different definitions, assessment tools and thresholds. Specialist services also see highly selected groups that do not represent the wider population. There is currently no reliable population estimate of how common PDA is.

How do I know if my child has PDA?

Persistent difficulty responding to everyday demands may be worth exploring when it causes substantial distress or affects daily life, but demand avoidance alone does not establish PDA. A broader assessment can consider autism, ADHD, anxiety, sensory experiences, executive functioning, communication, trauma and the child's developmental and environmental context. 

References

1. Newson, E., Le Maréchal, K., & David, C. (2003). Pathological demand avoidance syndrome: a necessary distinction within the pervasive developmental disorders. Archives of disease in childhood, 88(7), 595–600. https://doi.org/10.1136/adc.88.7.595
2. O’Nions, E., Gould, J., Christie, P., Gillberg, C., Viding, E., & Happé, F. (2016). Identifying features of ‘pathological demand avoidance’using the Diagnostic Interview for Social and Communication Disorders (DISCO). European child & adolescent psychiatry, 25(4), 407-419.
3. Stuart, L., Grahame, V., Honey, E. and Freeston, M. (2020), Intolerance of uncertainty and anxiety as explanatory frameworks for extreme demand avoidance in children and adolescents. Child Adolesc Ment Health, 25: 59-67. https://doi.org/10.1111/camh.12336
4. White, R., Livingston, L.A., Taylor, E.C. et al. Understanding the Contributions of Trait Autism and Anxiety to Extreme Demand Avoidance in the Adult General Population. J Autism Dev Disord 53, 2680–2688 (2023). https://doi.org/10.1007/s10803-022-05469-3
5. Kildahl, A. N., Helverschou, S. B., Rysstad, A. L., Wigaard, E., Hellerud, J. M., Ludvigsen, L. B., & Howlin, P. (2021). Pathological demand avoidance in children and adolescents: A systematic review. Autism, 25(8), 2162-2176.
6. Kenny, N., & Doyle, A. (2024). A phenomenological exploration of the lived experience of adults experiencing pathological demand avoidance. Neurodiversity, 2. https://doi.org/10.1177/27546330241277075
7. Gillberg, C., Gillberg, I. C., Thompson, L., Biskupsto, R., & Billstedt, E. (2015). Extreme (“pathological”) demand avoidance in autism: a general population study in the Faroe Islands. European child & adolescent psychiatry, 24(8), 979-984.
8. Eaton, J., & Weaver, K. (2020). An exploration of the Pathological (or Extreme) Demand Avoidant profile in children referred for an autism diagnostic assessment using data from ADOS-2 assessments and their developmental histories. Good Autism Practice (GAP), 21(2), 33-51.
9. Company, D., & Rotella, J. A. (2026). A Systematic Review of Pathological Demand Avoidance (PDA): A Veritable Diagnosis or a Case of Circular Logic?. Journal of Autism and Developmental Disorders, 1-11.
10. Identification and diagnosis process - PDA Society
11. O'Nions, E., Viding, E., Greven, C. U., Ronald, A., & Happé, F. (2014). Pathological demand avoidance: exploring the behavioural profile. Autism : the international journal of research and practice, 18(5), 538–544. https://doi.org/10.1177/1362361313481861
12. Kamp-Becker, I., Schu, U., & Stroth, S. (2023). Pathological Demand Avoidance: Current State of Research and Critical Discussion. Zeitschrift fur Kinder-und Jugendpsychiatrie und Psychotherapie, 51(4), 321-332.
13. Reilly, C., Atkinson, P., Menlove, L., Gillberg, C., O’Nions, E., Happé, F., & Neville, B. G. (2014). Pathological demand avoidance in a population-based cohort of children with epilepsy: four case studies. Research in developmental disabilities, 35(12), 3236-3244.
14. Johnson M and Saunderson H (2023) Examining the relationship between anxiety and pathological demand avoidance in adults: a mixed methods approach. Front. Educ. 8:1179015. doi: 10.3389/feduc.2023.1179015
15. Kofler, M.J., Soto, E.F., Singh, L.J. et al. Executive function deficits in attention-deficit/hyperactivity disorder and autism spectrum disorder. Nat Rev Psychol 3, 701–719 (2024). https://doi.org/10.1038/s44159-024-00350-9
16. Goodson, A. (2018). Emotion regulation and executive function in children and adolescents with autism spectrum disorder and pathological demand avoidance traits (Doctoral dissertation, UCL (University College London)).
17. Haire L, Symonds J, Senior J and D’Urso G (2024) Methods of studying pathological demand avoidance in children and adolescents: a scoping review. Front. Educ. 9:1230011. doi: 10.3389/feduc.2024.1230011
18. Haire L, Symonds JE, Senior J and Pace U (2023) Practicing psychologists’ accounts of demand avoidance and extreme demand avoidance in children and adolescents. Front. Educ. 8:1230014. doi: 10.3389/feduc.2023.1230014
19. Connolly SE, Constable HL and Mullally SL (2023) School distress and the school attendance crisis: a story dominated by neurodivergence and unmet need. Front. Psychiatry 14:1237052. doi: 10.3389/fpsyt.2023.1237052
20. Curtis, S., Izett, E. The experience of mothers of autistic children with a pathological demand avoidance profile: an interpretative phenomenological analysis. Discov Ment Health 5, 5 (2025). https://doi.org/10.1007/s44192-025-00127-3
21. Nawaz, S., & Speer, S. (2025). What are the experiences and support needs of families of autistic children with Extreme (or ‘Pathological’) Demand Avoidance (E/PDA) behaviours?. Research in Autism Spectrum Disorders, 119, 102515.
22. O'Nions, E., Christie, P., Gould, J., Viding, E., & Happé, F. (2014). Development of the 'Extreme Demand Avoidance Questionnaire' (EDA-Q): preliminary observations on a trait measure for Pathological Demand Avoidance. Journal of child psychology and psychiatry, and allied disciplines, 55(7), 758–768. https://doi.org/10.1111/jcpp.12149
23. Egan, V., Linenberg, O. & O’Nions, E. The Measurement of Adult Pathological Demand Avoidance Traits. J Autism Dev Disord 49, 481–494 (2019). https://doi.org/10.1007/s10803-018-3722-7
24. Murrihy, R. C., Drysdale, S. A., Dedousis-Wallace, A., Rémond, L., McAloon, J., Ellis, D. M., ... & Ollendick, T. H. (2023). Community-delivered collaborative and proactive solutions and parent management training for oppositional youth: a randomized trial. Behavior Therapy, 54(2), 400-417.
25. Greene, R., & Winkler, J. (2019). Collaborative & Proactive Solutions (CPS): A review of research findings in families, schools, and treatment facilities. Clinical Child and Family Psychology Review, 22(4), 549-561.
26. Saddik, N., & Mason, J. (2026). Navigating adulthood with extreme demand avoidance: A qualitative exploration of differences, accommodations, and lived experiences. Neurodiversity, 4. https://doi.org/10.1177/27546330261471396
27. Haire, L., Symonds, J. E., Senior, J., & Pace, U. (2023). Practicing psychologists’ accounts of demand avoidance and extreme demand avoidance in children and adolescents. Frontiers in Education, 8, 1230014. https://doi.org/10.3389/feduc.2023.1230014
28. Cadwell, A. (2026). Pathological Demand Avoidance: The Diagnostic Gap, Neurobiological Misunderstanding, and Iatrogenic Harm. Neurobiological Misunderstanding, and Iatrogenic Harm (June 18, 2026).
29. Doyle, A., & Kenny, N. (2023). Mapping experiences of pathological demand avoidance in Ireland. Journal of Research in Special Educational Needs, 23(1), 52-61.
30. Greaves, N. (2025). Emotion regulation difficulties and differences in autism including demand‐avoidant presentations—A clinical review of research and models, and a proposed conceptual formulation: Neural‐preferencing locus of control (NP‐LOC). JCPP advances, 5(2), e12270.
31. Moore, A. (2020). Pathological demand avoidance: What and who are being pathologised and in whose interests?. Global Studies of Childhood, 10(1), 39-52.
32. Rai, A. J., Rishworth, B., Gutierrez, R., & Ludlow, A. K. (2026). Sensory reactivity and intolerance to uncertainty: what characterises demand avoidance behaviours in children and adolescents with pathological demand avoidance?. Research in Autism, 131, 202816.
33. White, R., Livingston, L. A., Taylor, E. C., Close, S. A., Shah, P., & Callan, M. J. (2023). Understanding the contributions of trait autism and anxiety to extreme demand avoidance in the adult general population. Journal of Autism and Developmental Disorders, 53(7), 2680-2688.