Autism in adults: the signs and how they show

Plenty of adults spend years feeling that ordinary days cost them more energy than they seem to cost others. You might have built your own ways to fit in, without ever having a name for why. Seeing yourself in a description of autism can bring relief, worry or a bit of both, and either reaction is fine. At AuDHD Psychiatry, we’re here to help you make sense of what you’ve noticed.

What are the signs of autism in adults?

Autism in adults often shows in how you connect and talk with other people. Its medical name is autism spectrum disorder (ASD) [1]. Adult signs can look a lot like those in children [2]. In adults, signs linked to social communication include [2] [3]:

• finding it hard to talk to other people, and spending more time alone.
• finding facial expressions, gestures or tone of voice difficult to read.
• taking phrases literally, or missing sarcasm.
• finding eye contact uncomfortable, or unwritten social rules confusing.
• struggling to judge when it’s your turn to speak.
• giving opinions in a very direct and honest way.

You might recognise one or two of these, or nearly all of them. Not every autistic adult shows every sign, and no single sign settles the question [3]. Our guide to the core signs of autism at any age covers children as well.

Routines, interests and the senses in autistic adults

Autistic adults often keep fixed ways of doing things [2]. A sudden change of routine can be genuinely distressing [2]. You might take the same route to work every day and feel thrown when roadworks force a detour. Many autistic adults prefer order and predictability too [3].

Interests can run deep, with long, focused attention on a specialist subject [2]. Yours might be a subject you’ve followed for years, such as trains, coding or a favourite band. Repetitive movements such as rocking or flicking your fingers, known as stimming, are part of this side too [2]. Your senses can also work differently, with light, sounds, smells, tastes or textures feeling too strong or barely there [2]. A noisy open-plan office, for instance, can leave some autistic adults drained. Our guide to sensory processing differences explains why.

What being autistic can feel like as an adult

Being autistic as an adult can mean steady effort that other people never see [3]. Autistic adults often describe the inner side of autism in ways like these [3]:

• feeling different from people their own age.
• having to think about things others do automatically, such as making eye contact.
• relying on coping strategies to get through the day.
• finding relationships, job interviews or applications tougher than most.

Much of that work goes unnoticed by the people around you. When the strain builds up, some adults reach overwhelm, meltdowns and shutdowns, severe mental health difficulties or autistic burnout [3]. Many autistic adults recognise themselves in books, videos or posts by autistic people [3].

Why autism is often missed until adulthood

Autistic adults were autistic as children too, but the signs may have been missed [3]. Many adults learn to adapt so their signs aren’t easy to notice, which the NHS calls masking [2]. To other people, you may simply seem to be coping. Masking can make everyday life and social contact feel exhausting and stressful [2]. Signs can be harder to see in women, partly because of masking [2]. Our guides cover autistic masking and how autism can show in women in more depth.

Autism was long seen as a childhood condition, so many adults went without a diagnosis as children [4]. A large 2023 study of English GP records made projections for 2018 [4]. It estimated that 59 to 72 in 100 autistic people in England may have had no diagnosis [4].

Autism alongside ADHD, anxiety or depression in adults

Autistic people are more likely to have anxiety, depression, eating disorders or epilepsy [1]. ADHD is also more common in autistic people [1]. Any of these, or a learning disability, can make autism harder to spot [2].

Overlap like this is one reason clinicians look at the whole picture. NICE asks clinicians who assess adults to check for other conditions too [5]. Social anxiety disorder and obsessive-compulsive disorder are among them, as both can look like autism or sit alongside it [5]. Our guide to how ADHD and autism differ sets the two side by side.

What helps autistic adults day to day?

Practical support is what helps, because autism isn’t an illness to be cured [1]. The help on offer is aimed at daily life: friendships, free time and work. NICE suggests social learning, structured leisure and supported employment programmes [5]. These are mainly for adults with no learning disability, or a mild one [5]. You can choose which of these, if any, feel useful. NICE advises against special diets, vitamins, supplements and medicines for the core features of autism in adults [5]. Families, partners and carers can also be offered an assessment of their own needs [5]. Our guide to support and treatment for autism goes into more detail.

When are signs in adults worth a closer look?

Signs are worth a closer look when they last and get in the way of work, study or relationships [5]. For adults, NICE suggests a short ten-question screen, the AQ-10 [5].

Looking further may help if:

• you’ve had these signs since childhood.
• you’ve wondered about autism for years.

It might not be right today if:

• you need urgent help. Call NHS 111 and choose the mental health option, or in Northern Ireland call Lifeline free on 0808 808 8000, any time. In an emergency, call 999 or go to A&E [6].
• it’s for a child: our child autism assessment covers ages 6 to 17, and a parent can be present.

A GP can often refer you to a local autism team, as how an autism diagnosis works explains [7]. AuDHD Psychiatry offers an online adult autism assessment in two appointments, one an interview with someone who knows you well. If nobody can join, we can still assess you. There’s also an assessment for ADHD and autism together. Start with our free autism test, a screen, not a diagnosis, or a free 15-minute call.

Questions people ask

In short

Autism in adults is lifelong, and its signs can go unnoticed well into adult life. The signs cover social contact, routines, deep interests and the way your senses respond. Other conditions, such as anxiety, depression or ADHD, can blur that picture. If the pattern feels familiar, a GP or a clinician at AuDHD Psychiatry can look at it with you. Jotting down what you’ve noticed since childhood is a useful first step before you speak to anyone.