Demand Avoidance Research9 min read6 September 2026

PDA in Adults: A Contested Label With Real Evidence Underneath

Pathological Demand Avoidance appears in neither diagnostic manual, and the small body of adult research points somewhere the child research did not.

The email needs answering. Nobody is waiting on it urgently, nobody has asked twice, and the person who put it on the list this morning was you. Then it became a thing that had to be done, and something went still. For a lot of adults that pattern eventually leads to a search, and the search leads to three letters: PDA, or Pathological Demand Avoidance. What the search results tend to skip is that PDA is one of the most argued-over ideas in autism research, that it appears in neither of the two diagnostic manuals clinicians work from, and that the small amount of research done specifically on adults has turned up something the research on children would not have predicted. All of it is worth knowing before deciding what to do about it. None of what follows is a diagnosis and none of it is medical advice. It is a map of what has been studied, including the parts that argue with each other.

What is going on

It Came From 150 Case Files and Never Reached a Manual

Described, measured and argued about for forty years, and still not a diagnosis you can be given on its own.

Elizabeth Newson described the profile at the University of Nottingham from the 1980s onwards, working with children who had been referred to her because they reminded their doctors of autism without matching it. The 2003 paper she published with Le Maréchal and David set out 150 cases and argued that PDA deserved recognition as a separate entity, noting an equal sex ratio, which stood out sharply against autism referrals at the time. Every study since has traced its definition back to that description. PDA appears in neither the DSM-5 nor the ICD-11, which is why a UK clinician will normally record an autism diagnosis with a note about a demand avoidant profile rather than diagnosing PDA by itself. The National Autistic Society and the PDA Society both recognise the profile and publish guidance on supporting it.

→Recognised in UK practice and absent from the manuals, which is why two people can get assessed and come away with completely different paperwork.

The Sharpest Criticism Is That the Evidence Loops Back On Itself

Most of it rests on one 2003 description, tested with questionnaires written from that same description.

Jonathan Green and colleagues put the case plainly in The Lancet Child and Adolescent Health in 2018, under the title Pathological Demand Avoidance: symptoms but not a syndrome. Arvid Kildahl and colleagues then reviewed thirteen studies in 2021 and found most of them relied on parent report alone, both to decide who counted as having PDA and to measure what it related to, which leaves the results exposed to common method and confirmation bias. Dylan Company and Joe Anthony Rotella took it further in a 2026 systematic review in the Journal of Autism and Developmental Disorders, concluding that identification varies widely across studies, leans heavily on subjective measures, and carries enough circularity to make a distinct diagnosis highly improbable at this stage. Their word for it, in the title, is circular logic.

→The experience being described is not what is in question. What the label adds on top of it is.

In Adults, the Traits Track ADHD More Closely Than Autism

The finding that catches everyone out, and it comes from the only measure ever built for adults.

Vincent Egan, Omer Linenberg and Elizabeth O'Nions published the adult version of the Extreme Demand Avoidance Questionnaire in 2019: 26 self-report items, tested across samples of 347 and 191 people, with strong internal reliability at alpha 0.92. Items cover things like being driven by a need to be in charge. Egan then used it with Elinor Bull and Grace Trundle on a community sample in 2020, and the result cuts against the way PDA is usually framed. ADHD traits correlated with demand avoidance scores at r = 0.71. Autistic traits added close to nothing once ADHD, antagonism and emotional instability were in the model, and those three together accounted for roughly 65% of the variance. That is one community sample using self-report, so it settles nothing on its own. It is also the best adult evidence currently available.

→The adult data and the child literature disagree about which neurotype this sits closest to.

Anxiety and Uncertainty Account for About a Third of It

Which is a large share, and which leaves most of it still unexplained.

Matt Johnson and Helen Saunderson ran the most direct adult test of the anxiety account in 2023, with 163 adults completing measures of demand avoidance, mood and anxiety, and intolerance of uncertainty, meaning the difficulty of sitting with a situation whose outcome you cannot predict. The full model explained 37% of the variance in demand avoidance scores: the anxiety measure carried 27.8% of that, age carried 6.8%, and intolerance of uncertainty added a further 1.9%. Thirteen participants were then interviewed at length, and all thirteen described fluctuating physical arousal, low tolerance for uncertainty, a need for sameness, and trouble predicting how things would go. One more result deserves attention. Scores fell as age rose, and the older participants described building a wider sense of how situations tend to turn out, which left them leaning on extreme avoidance less often. The sample was largely students with a mean age of 25, a limitation the authors name themselves.

→Anxiety is a large piece of this picture rather than the whole of it, and the study says so directly.

For Adults, the Demand Often Comes From Inside

A parent can withdraw a request. The one you made yourself has nobody to withdraw it.

Self-imposed demands were in Newson's original description, and they are the part adults tend to describe as hardest, because there is no one on the other side of the negotiation. Neil Kenny and Alison Doyle published a phenomenological study in Neurodiversity in 2024, drawing on survey responses and in-depth interviews with Irish adults who were either diagnosed with or self-identifying with PDA. Four themes came out of it: bidirectional social challenges, life experiences, trust and safety, and accepting our truth. What participants said would improve daily life was consistent throughout: greater autonomy and flexibility across every part of it, plus wider awareness of the profile. Autonomy is the word that keeps recurring in adult accounts, which is why some people read the acronym as Persistent Drive for Autonomy instead. Others keep the original wording on purpose, on the grounds that it describes how all-consuming the experience is. Both positions come from inside the community.

→The mechanism runs without anyone else in the room, which is what makes the adult version its own thing.

What to do about it

So what helps?

No support approach for PDA has ever been through a randomised trial. That belongs at the top of this section rather than buried in it.

The guidance most widely used in the UK is the PDA Society's PANDA framework: pick battles, manage anxiety, negotiate and collaborate, disguise and manage demands, and adapt. It was built from practitioner and family experience, it is written mainly for people supporting children, and adults adapt it for themselves. It has not been tested in a controlled trial, and the PDA Society makes no claim that it has. The nearest thing to a tested principle underneath it comes from a different field altogether. Self-determination theory has forty years of evidence behind it, including a meta-analysis of 144 studies covering more than 79,000 students, all pointing the same way: conditions that support genuine autonomy produce more durable motivation than controlling ones, and a separate meta-analysis of 36 intervention studies across 11,792 participants found the same thing. None of that work was done on demand avoidance. It is a principle borrowed rather than a result imported, and it is still the strongest available evidence that a real choice changes what happens next.

The reframe

USUAL FRAMING

"How do I make myself do it?"

MORE USEFUL

"How do I make this mine again?"

A real choice needs a real alternative behind it. Two options you would genuinely accept works. One option with the word "choose" attached to it is the same demand wearing a hat.

Anxiety carried most of the weight in the Johnson and Saunderson model, so the state your body is in before the demand arrives changes how the demand lands.

Adults in the Kenny and Doyle study named the same thing repeatedly: flexibility from the people and systems around them, rather than more effort from themselves.

The business case

PDA describes something adults recognise the moment they read it, and something researchers have spent twenty years failing to agree on. The adult evidence points at anxiety, at intolerance of uncertainty, at ADHD traits ahead of autistic ones, and at autonomy as the lever that moves the outcome. Which of those is doing the work in any given moment decides whether a strategy helps or quietly fails.

Coji is built around offering rather than instructing, which is the one principle here with decades of evidence behind it. Nothing gets scheduled without being offered first, plans move when energy moves, and a task can sit untouched without turning into a red number demanding attention. Whether that helps with demand avoidance specifically is something nobody can tell you yet, including anyone selling an app, because the study has not been run. If you try it and something about it makes the avoidance worse, that is the more useful message to send.

Common questions

What is PDA in adults?

PDA stands for Pathological Demand Avoidance, a profile first described by Elizabeth Newson in which everyday demands and expectations, including ones a person sets for themselves, trigger an anxiety-driven need to avoid them. In adults it is usually self-identified or noted alongside an autism assessment rather than diagnosed on its own.

Is PDA a real diagnosis?

It is not listed in the DSM-5 or the ICD-11, so it cannot be given as a standalone diagnosis. UK organisations including the National Autistic Society and the PDA Society recognise it as a profile, and a 2026 systematic review in the Journal of Autism and Developmental Disorders concluded that the current evidence is too circular to support it as a distinct diagnosis at this stage.

What does PDA look like in adults?

Adults describe avoiding tasks they chose themselves, losing interest in an activity as soon as it becomes an obligation, and a strong need to feel in charge of how and when things happen. The Kenny and Doyle 2024 study found participants describing pervasive anxiety, difficulty negotiating everyday demands, and a need for trust and safety in their relationships.

Is PDA linked to autism or to ADHD?

The child research treats it as an autism profile. The adult research points elsewhere: Egan and colleagues found in a 2020 community sample that ADHD traits correlated with adult demand avoidance scores at r = 0.71, while autistic traits added almost nothing once ADHD, antagonism and emotional instability were accounted for.

Why do I avoid things I actually want to do?

Self-imposed demands were part of the original PDA description and adults often report them as the hardest kind, because there is no one else to renegotiate with. The research on autistic inertia documents a related pattern where difficulty starting shows up on enjoyable tasks too, which rules out simple dislike as the explanation.

How do adults manage demand avoidance?

No approach has been tested in a randomised trial. The PDA Society PANDA framework, built from practitioner and family experience, covers picking battles, managing anxiety, negotiating collaboratively, phrasing demands indirectly, and adapting flexibly. The strongest related evidence comes from self-determination theory, where autonomy-supportive conditions consistently produce more durable motivation than controlling ones.

Keep reading

Task Paralysis: What the Research Actually SaysThe other half of the not-starting question, and four bodies of evidence that disagree about it.Your Brain Isn’t Broken: What New Research Says About ADHD and AutismInteroception, timing circuits, masking, and where the co-occurrence research has got to.How your neuro profile worksThe in-app neuro maps behind how Coji reads your patterns. Not a diagnosis.What Coji does for your brainADHD, autism, anxiety, and chronic illness, and how the app adapts to each.Try Coji free for your first monthOffered, never scheduled on your behalf.

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