Imposter syndrome and doubt

In community writing, imposter syndrome means doubting that one is really autistic, even after a diagnosis or a self-identification that made sense. Megan Griffith writes that after diagnosis, "self or professional", most people she knows feel two things, "validation and imposter syndrome": first "This explains literally everything", then doubt, wondering "if we made things up or exaggerated" or convinced themselves "and/or our assessor".^c1 Pete Wharmby, diagnosed in his late thirties, writes that it "is common with late-diagnosed autistic people, and it works overtime with me", and that he still feels "a phony, a faker, a charlatan".^c2

The clinicians Donna Henderson, Sarah Wayland and Jamell White answer the question "Is there such a thing as autistic imposter syndrome?" with "Yes!" In their account it affects some late-diagnosed people who camouflage: the diagnosis relieves them, yet "they may go through periods when they worry that they don't 'deserve' the diagnosis."^c3 They describe a person thinking, "I'm really [smart/successful/social/funny/etc.], so maybe I'm not really autistic."^c4

The psychologists Pauline Rose Clance and Suzanne Imes named the "impostor phenomenon" in 1978. They described "an internal experience of intellectual phonies" that they found especially strong in high-achieving women.¹ Their observations came from the previous five years of individual therapy, groups and college classes with over 150 highly successful women, mostly white, middle to upper class and aged 20 to 45, who were convinced that they were not intelligent and "have fooled anyone who thinks otherwise".¹ They called it a phenomenon, not a syndrome, and wrote that in their clinical experience it was much less frequent and less intense in men, though male colleagues they consulted gave mixed opinions.¹

A 2020 systematic review of 62 studies with 14,161 participants found rates of impostor feelings from 9 to 82%, depending largely on the questionnaire and cut-off used; they were common in both men and women, particularly high among ethnic minority groups, and often came with depression and anxiety, and no study published by 2018 had tested a treatment. The studies varied widely, and publication bias may be present.²

Autistic writers took up the everyday phrase "imposter syndrome" for a narrower doubt, about whether one belongs to the diagnosis at all. Henderson, Wayland and White call it "autistic imposter syndrome".^c3

Writers give reasons the doubt takes hold. Griffith names four: a narrow public image of autism and ADHD as conditions of children, "especially white boys"; a literal reading of the diagnostic criteria; criteria in language that is "cold, clinical, and highly deficits-based"; and criteria written from the view of "an exasperated teacher or parent or clinician", leaving out what being autistic is like inside.^c1

Luke Beardon, who writes for autistic adults, describes an irony. People who have struggled for years tell him they feel they "should be struggling more than they are", though their struggles, as he sees it, have eased only because they have recently learned to adapt their lives to being autistic; understanding themselves better leaves them feeling "not as deserving of the autism moniker".^c5 Henderson and colleagues describe "chronic invalidation": people who do not "look autistic" must fight "both internal and external perceptions that it's not 'real autism'", which can bring self-doubt and anxiety.^c6

Other people's reactions feed it. Sol Smith writes that "The naysayers who think that the upswing in autism diagnoses is a trend perpetuate feelings of guilt and being an impostor."^c7 To a client who had suspected for years, he replied that he had not met many neurotypical people "who read about autism and then spend years being suspicious that they could be autistic."^c7 Wharmby writes that the feeling makes him think he is over-reacting to ableism, "as if it shouldn't upset me because I'm not really autistic."^c2

Doubt about being "really" autistic appears in qualitative studies of late-diagnosed adults. In an Australian oral history study of 26 autistic adults diagnosed after 35, some said they at times questioned their own diagnostic status; one said "maybe I'm not autistic enough", and another described herself as a "doubter" with "imposter syndrome" who sought reassurance from her counselor.³ In interviews with 12 UK adults diagnosed in adulthood about telling others, one subtheme was "Disbelief and Imposter Syndrome", and not being believed was common.⁴ In blogs by 23 autistic women, all but one of whom said they had a formal diagnosis, feeling that they did not fit the diagnosis led to imposter syndrome, and some described feeling like a fraud.⁵

People who identify as autistic without a diagnosis describe a related doubt, about whether they are autistic at all. "Managing self doubt" was one of five themes in interviews with 37 self-diagnosed adults, and "self-doubt and self-diagnosis" one of three themes in interviews with six self-diagnosed women and gender-diverse adults.^6,7

The Australian authors note that this diagnostic self-doubt "has received limited analytic attention".³ No study found as of October 2026 has measured how often autistic people have it, or used an impostor questionnaire with autistic people.

Participants in these studies pointed to other people's expectations. In the UK disclosure study, participants attributed not being believed to a mismatch between others' picture of an autistic person and how they came across ("you don't look autistic"). The authors interpret the strength of the imposter feelings as depending on when people disclosed and whether they had come to terms with being autistic.⁴ One woman felt "not autistic enough" after her psychologist had to double-check during her assessment.⁴ The women bloggers often traced their difficulties after diagnosis to male stereotypes of autism.⁵ The Australian authors write that some interviewees suggested negative framings of autism made them doubt their own and others' status as "either too successful or too 'normal' to be autistic".³

The UK authors suggest, as a possibility they did not test, that the feeling might be more common in women and in people diagnosed late, because of male bias in diagnosis and the use of camouflaging.⁴ Most of the samples here were women, so any pattern by sex reflects who was recruited. A 2026 preprint, not yet peer reviewed, interviewed five autistic women aged 25 to 49 about doubt after diagnosis. Their doubt centered on what counts as "real" autism: stereotypes, their own competence and masking, wanting to distance themselves from talk of a trend, and the breadth of "the spectrum". Diagnosis did not bring closure, the women described a double bind of being "too autistic" or "not autistic enough", and the authors interpret masking as appearing to sustain the doubt.⁸

The doubt is tied up with the argument over self-identification. Self-diagnosis is, in Victoria Rodríguez-Roldán's words, "one of the perennial debates in the autistic community", and who gets a diagnosis depends on privilege.^c8 Beardon answers the worry that "if we allow self-identification then everyone will be doing it" by saying he does not believe many non-autistic people would claim to be autistic: "being autistic really doesn't give you much of a privilege in life." He adds that wondering about it does not mean "you are automatically part of the autistic clan".^c5 The research on whether self-identification is accurate, including concerns from clinicians, is in Assessment; studies so far compare questionnaires, not clinical assessments. In an online survey of 893 diagnosed and 245 self-diagnosed adults, the self-diagnosed were more often older, women or employed, and the two groups were remarkably similar in stigma, self-esteem, quality of life and autism identity; the author calls for research on whether self-diagnosed people meet diagnostic criteria.⁹ In a 2026 preprint drawing on a Cambridge research database, 917 self-identified people aged 16 to 80 scored between 3,275 diagnosed and 11,911 non-autistic people on an autistic-traits questionnaire, did not differ from the diagnosed on a test of reading emotions from eyes, and reported similarly high rates of mental health conditions, but fewer other neurodevelopmental conditions; the authors describe a profile "broadly resembling, but not identical to" the diagnosed group.¹⁰

The second argument is about what "the spectrum" means. Smith writes that one of the most maddening replies to an adult's disclosure is "Well, we're all on the spectrum", which seems to include the person while dismissing what they said.^c9 He argues that claiming everyone is on a spectrum trivializes the needs of people who have the condition, as no one of average height would claim to be on a dwarfism spectrum.^c10 Orion Kelly writes that the idea of a single line from high to low functioning "is fanciful".^c11 Writers given a lighter support label describe being told they are barely autistic, which is discussed in Support levels and Late diagnosis.