Undiagnosed autism in adults

In a study of English health records, diagnosis rates dropped sharply with age. Children today are diagnosed far more often than adults over 50 or 70, even though autism is not new.

This gap is mostly about awareness and changing ideas of autism, not about autism suddenly becoming more common.

A large review found that girls who meet the criteria for autism are at higher risk of not being diagnosed than boys.

Autistic women are also more likely to have been given other mental health diagnoses first, which they later felt were wrong.

Autistic adults describe “camouflaging”: copying others, rehearsing conversations and hiding things that come naturally. It can hide autism from teachers, doctors and even yourself.

The better someone is at blending in, the easier it is for their struggles to be missed.

In an Italian study, adults diagnosed autistic had usually first seen a mental health professional around age 13. Their autism was recognised about 11 years later.

Many had been given other diagnoses along the way. Some were accurate, and some missed the bigger picture.

In a Swedish clinic, autistic adults who had never been identified were just as likely to have a job as other patients. Their struggles were less visible, not smaller.

People described feeling isolated and out of place from childhood, sometimes like an “alien” among their peers, without understanding why.

This feeling is common, and it is not proof of anything by itself. But if it has followed you all your life, it is worth being curious about.

Before diagnosis, many people decided the problem was them: that they were difficult, unlikeable or simply not trying hard enough.

Autistic adults describe rehearsing conversations, studying other people’s faces and pushing through noise and light that feel overwhelming. Other people rarely see this work.

Many feel drained after social time and need a long time to recover, without knowing why it seems easier for others.

Many late-diagnosed adults spent years being treated for anxiety and depression. That help can matter, but it may not touch the reason life feels so hard.

About 12% of the adults in the Dutch study felt they had wrongly been given a personality disorder diagnosis. Women were nearly three times as likely to report this as men.

Some features, like intense emotions after overload or struggles with relationships, can look alike from the outside. The reasons behind them can be very different.

In a Swedish adult clinic, 87% of autistic patients who had never been identified also had an anxiety condition, compared with 37% of other patients.

Anxiety and depression can be real and still be a response to years of overload, masking and not fitting in. Treating them without seeing the autism may only help so much.

Some adults in the Dutch study felt that a past diagnosis of burnout or chronic fatigue had really been about their unrecognised autism.

Autistic burnout is described as exhaustion, loss of skills and lower tolerance for stimulation after long-term stress, often from masking and life demands.

In the Swedish clinic, ADHD or tic conditions were found in 90% of autistic patients. Having one diagnosis doesn’t rule out another.

Adults in research described camouflaging as tiring and stressful. Some felt they had lost track of their real self after years of acting a part.

In research on autistic burnout, people said being able to be openly autistic, less masking and lowering demands helped them recover.

Knowing you’re autistic can make it easier to give yourself these things, instead of trying to “push through” again.

Autistic adults found in a Swedish clinic had, on average, about twice as many other mental health conditions as other patients.

In a UK clinic for adults seeking an autism diagnosis, most people said they had had thoughts of suicide at some point. They had been diagnosed late, at 31 on average, and the researchers said the delay may add to the risk.

Adults diagnosed later in life said it helped them make sense of their past, understand their needs and plan ahead for hard situations.

A formal diagnosis can also make it easier to ask for changes at work or college.

Some people worry about not being believed, especially if they mask well. Others are not sure what difference a diagnosis would make.

There is no wrong choice. You can take time, and you can change your mind later.

Things to think about

• Do I need a diagnosis for support at work, college or with benefits?
• How would I feel if the answer is yes? If it’s no?
• What can I afford, and is there a wait?
• Who could support me through it?

Your primary care provider can often refer you. It helps to ask whether the clinician regularly assesses adults.

Some people grieve for their younger self, who tried so hard without knowing why things felt difficult.

Things that can help

• Write a letter to your younger self
• Talk with other late-identified autistic people
• Let yourself feel angry, without rushing to “move on”

Being diagnosed helped people reinterpret their histories, easing years of self-blame.

Parents sometimes feel they should have noticed. It can help to explain that autism was rarely recognised in people like you back then.

You don’t have to tell anyone until you’re ready. The worksheet “Telling people about my autism” in the Autism in adults guide can help you plan.

Adults in research said professional support after diagnosis was lacking. Much of their help came from online autistic communities.

People diagnosed in their 50s had often spent decades being treated for anxiety and depression and feeling isolated, before anyone mentioned autism.

When routines and familiar supports change, coping strategies that worked for years may stop working. Understanding your autism can help you plan for these changes.

In research with adults over 50, a diagnosis was mostly seen as a positive step that helped people understand and look after their needs.

Autistic self-advocacy groups are run by and for autistic people. They share information, push for respect and help people feel less alone.

Late-diagnosed adults often say online and in-person peer groups gave them the most useful support.

The Autism Society’s National Helpline (1-800-328-8476) can connect you with local affiliates and resources. It is not a crisis line.

Ways to raise it gently

• Choose a calm, private moment
• Describe what you admire, not just what is hard
• Offer information, not a verdict: “I read something that made me think of you”
• Respect their answer, even if it’s “not now”

Things that help

• Believe them, even if they “don’t seem autistic”
• Make space for quiet and recovery time
• Ask what changes would help at home
• Avoid saying “everyone’s a bit autistic”