Autism in adulthood: from recognition to diagnosis

One person describes feeling exhausted after a conversation. Another talks about mentally rehearsing what to say, or finding certain sounds so uncomfortable that it is difficult to stay in a room. Watching videos about autism and neurodivergence, some people find words for experiences they have known for years.

That recognition can bring relief: perhaps something that has always felt like a personal failing has another explanation. It can also raise a question that is hard to put aside: “Could I be autistic?”

Recognising yourself in someone else's account does not establish that you are autistic. It can, however, be a starting point for understanding your own history. Those questions deserve to be taken seriously, even when the answer is not yet clear.

Neurodivergence and autism are not the same thing

These terms often appear together on social media, but they do not mean the same thing. Neurodivergence is a broad term, not a clinical diagnosis. It is used to describe ways of thinking and functioning that differ from what is considered more typical, including autism and attention deficit hyperactivity disorder (ADHD). The boundaries of its use vary.

The neurodiversity perspective invites us to consider these differences without reducing a person to their difficulties. Their abilities, preferences and living conditions matter too. Recognising this diversity is compatible with acknowledging difficulties and support needs, which can sometimes be substantial.^[1]

Autism, in turn, is a neurodevelopmental condition with defined diagnostic criteria. It involves persistent differences and difficulties in social communication and interaction, alongside restricted or repetitive patterns of behaviour, interests or activities. It can include sensory differences. For a diagnosis, this combination must have a significant impact on personal, social or working life.^[2]

Liking routines, feeling uncomfortable in groups or needing time to recover after socialising can be part of an autistic person's experience. None of these experiences, on its own, establishes that someone is autistic.

Does relating to accounts of autism online mean you are autistic?

A personal account can convey something that a clinical description may not capture as well: the effort of keeping up with a conversation, the difficulty of explaining discomfort, or the relief of finding people with similar experiences. In research on adult diagnosis, some people describe precisely this contact as the beginning of their search for an assessment.^[3]

The difficulty lies in moving from recognition to explanation. An account can accurately describe someone's life without distinguishing autism from other possibilities. The experience may be shared; the reason behind it may not be the same.

An analysis of posts on TikTok and Twitter found limited alignment between portrayals of autism and diagnostic criteria. The study assessed content, not the creators' diagnoses or the conclusions reached by viewers. It highlights the limitations of using these posts as a diagnostic tool, not that the experiences described are made up.^[4]

Some experiences are also less often heard. A review concerning autistic adults with intellectual disability found little research gathering their perspectives directly, particularly on their everyday lives rather than just interventions. Late recognition is one part of this picture, not a portrait of the whole spectrum or of the needs of people who require intensive support in everyday life.^[5]

Why might autism only be recognised in adulthood?

Late recognition does not mean that autism began at that point. The criteria require characteristics to be present during development, while allowing that they may become more apparent when demands exceed someone's capacity to cope, or when learned strategies no longer compensate sufficiently.^[2]

Changing schools, starting work or losing a familiar source of support can make longstanding difficulties more visible. The review of experiences of adult diagnosis includes accounts of transitions and crises that prompted people to seek help. It also describes stereotypes that had prevented recognition: having a job, a relationship or children had been treated as incompatible with being autistic.^[3]

Some difficulties may also be less visible because of the effort made to adapt. Hiding autistic characteristics or adjusting how you come across to others is often called masking or camouflaging. It can involve preparing responses or copying behaviours to avoid standing out. Although adapting social behaviour is not unique to autism, it is important to understand how much effort this takes for each person. Its relationship with mental health is not straightforward, however: a study following autistic adults for around two years did not confirm that greater camouflaging led to greater distress.^[6]

A conversation that seems effortless may therefore require preparation and effort that others do not see. Understanding that effort means looking beyond a single encounter.

How is autism assessed in adults?

An adult autism assessment should bring together developmental history, current functioning, clinical observation, and specific difficulties and needs. Where possible, and with the person's agreement, information from relatives and older records can help piece together that history. Other conditions and mental health difficulties also need to be considered, including those that may coexist with autism.^[7]

Questionnaires can help organise information or indicate whether a specialist assessment may be appropriate. They do not provide a diagnosis on their own. In a study of 93 adults assessed at a specialist clinic, questionnaires such as the AQ and RAADS-R showed limitations in distinguishing between those who received a diagnosis and those who did not. The authors recommend that none of these instruments be used in isolation.^[8]

A concrete situation makes the need for this broader picture clearer. Two people might avoid a group dinner for different reasons. One fears being judged and spends the day anticipating what could go wrong. The other struggles to follow several conversations at once and feels overwhelmed by the noise. Both experiences can also occur in the same person. Knowing only that someone avoids dinners does not explain what is happening: we need to ask what they experience, how long this has been going on and in which circumstances.

An assessment should look for a pattern across a person's life, rather than simply confirm a suspicion or dismiss it on the basis of a quick impression. If autism is not confirmed, the difficulties that prompted the search still deserve attention. It is reasonable to ask for an explanation of the outcome, including what remains unclear and what the next steps might be.

What happens after a diagnosis?

When a diagnosis is confirmed, the past may take on a different meaning. This can ease self-blame, make conversations easier and help people seek more appropriate support. Relief can coexist with sadness about difficulties lived through without an explanation, or uncertainty about the future. There is no single way someone should feel.^[3]

Understanding does not always come with practical help, however. A review of 19 UK studies found that support often focused on information and referral to other services. Participants also wanted help with everyday life, contact with other autistic people and psychoeducation: support to understand the diagnosis and manage its implications. The review could not establish the effectiveness of the available options and does not describe services in Portugal.^[9]

Research on this support is beginning to produce findings. In a trial involving 141 autistic participants aged 16 to 25, an online psychoeducation programme supported by a therapist improved autism knowledge and quality of life, with benefits maintained three months later. There were no corresponding improvements in anxiety or depression. These are promising findings, although limited to a young population and a short follow-up period.^[10]

Understanding your own needs and responses, making changes to situations you find difficult and treating coexisting problems are related but distinct goals. A person may need help with more than one of them.

What can you do if this possibility starts to make sense?

Gather examples, not just test scores. It can help to note concrete situations: what happened, what was difficult, how long it has been recurring and what helps. Recording times when you feel at ease can also show the conditions in which difficulties lessen.

Look for a professional or team experienced in adult autism. It is worth asking how the assessment works, what information will be considered and how the conclusions will be explained. Bringing questions and possibilities is part of that process; you do not need to arrive with a firm conclusion.

Do not put off addressing your needs while waiting for a diagnosis. Asking for clearer instructions or finding a quieter environment may address a specific difficulty. These are not tests of whether you are autistic, but ways to understand what makes daily life more manageable.

Pay attention to current distress. Persistent anxiety, depression, sleep difficulties or a marked decline in the ability to manage everyday life deserve assessment in their own right. You do not need to settle the question of autism before seeking help with what is difficult now.^[7]

Someone else's account can put into words what was previously hard to explain. An assessment can help clarify what those experiences mean in each person's history. Whether or not autism is confirmed, that process should also lead to something practical: understanding difficulties, recognising abilities and finding support with everyday life.