Autism in Adults: A Care Staff Guide to Signs, Masking and Support

A resident has lived in your service for months. They prefer the same chair, the same mug and the same order to the morning. When a new rota changes who supports them, they become withdrawn and stop eating. It is easy to call this "being difficult". It may instead be a sign of autism that nobody has recognised.

This guide explains what the NHS says about autism in adults, how it can look, why some adults hide it, and how care staff can support someone who is, or may be, autistic. It draws on the NHS pages "What is autism?" and "Signs of autism in adults", both last reviewed on 6 May 2026.

What autism is

The NHS describes autism as a difference in how the brain develops, which affects how a person sees and experiences the world. It is a type of neurodivergence, and people are born with it. The NHS is clear that autism is not an illness and has no treatment or cure, but there are ways to manage it and to get support.

The NHS says the cause is not known, that it can sometimes run in families, and that it is not caused by vaccines or medicines. It also notes that some autistic people have average or above-average intelligence, and that others have a learning disability. Autistic people are individuals, so the way autism shows up differs from one person to the next.

The NHS pages use the words "autism" and "autistic". "Autism spectrum disorder" is the medical term used for a diagnosis. It is sensible to ask the person which words they like to use about themselves.

Signs of autism in adults

The NHS groups the signs of autism in adults into four areas. Not everyone has all of them, and some will be subtle.

Social interaction

An autistic adult may find it hard to talk to people, may spend more time alone than with others, and may find it hard to make friends or have romantic relationships.

Communication

The NHS lists difficulty understanding facial expressions, gestures and tone of voice, and a tendency to take things literally. Its example is a phrase like "it's a piece of cake", which someone might take to mean actual cake rather than "it's easy".

Repetitive behaviour and routines

Signs include fixed ways of doing things, distress when a routine changes, repetitive movements (often called stimming), and very focused specialist interests.

Sensory differences

The NHS says an autistic person can be very sensitive, or not sensitive at all, to light, sounds, smells, tastes or textures. A noisy dining room or a flickering light may be much harder for one person to cope with than for another.

The NHS also notes that autism can affect a person's ability to stay in school, college or a job, and that mental health problems can be part of the picture.

Masking: when the signs are hidden

According to the NHS, some adults learn to adapt so that their autism is less noticeable. This is called masking. The NHS says masking can make everyday activities and social situations exhausting and stressful.

The NHS says autistic women may be more likely to mask. It describes copying other people, appearing to cope well socially, staying quiet and hiding feelings, and showing fewer repetitive behaviours. It adds that autistic men can mask too. A person who seems to cope well in company but is exhausted afterwards may be masking, so it is worth noticing what happens once the audience has gone.

Conditions that can sit alongside autism

The NHS says some autistic people have a learning disability. It also says autistic people are more likely to have epilepsy, anxiety, eating disorders and depression, and that ADHD is more common. The NHS says these conditions can make the signs of autism harder to see.

Our guide to diagnostic overshadowing in learning disability explains the related risk that a new symptom is wrongly put down to a person's condition, so that a physical or mental health problem goes unchecked.

If someone may be autistic

The NHS advises a person who thinks they might be autistic to see their GP. The GP may refer them for an autism assessment and explain what support is available locally. The NHS also says support may be available while they wait for an assessment.

The NHS pages are written for the person themselves and do not cover care settings, so the points below are practical suggestions for staff rather than NHS guidance. Anyone supporting a person through this should check that the person wants to pursue an assessment, because the decision is theirs.

Practical points for care staff

• Learn the person's routines and preferences and write them into their care plan, so every member of staff follows the same approach.
• Give notice of changes where you can, including changes of staff, rooms and appointments, and explain what will happen in plain, literal language.
• Look at the environment through the person's senses: lighting, background noise, strong smells and the feel of clothing or bedding.
• Do not assume that someone who copes well in public needs no support. Ask how they feel afterwards.
• Record what you see, with dates and examples, because clear notes help a GP or assessment team.
• Before putting a change in behaviour down to autism, ask whether pain, infection or a medicine could be the cause.

For a profile that some professionals describe within autism, see our guide to pathological demand avoidance (PDA) and autism for more detail.

Training and CPD

If you are building your team's understanding, the Oliver McGowan mandatory training on learning disability and autism is the place to start. Keep a record of what you learn for your own development, and browse professional development options on our CPD pages.

Key points to remember

• Autism is a lifelong difference in how the brain develops. It is not an illness.
• Signs in adults cover social interaction, communication, routines and repetitive behaviour, and sensory differences.
• Masking can hide autism and is tiring.
• Anxiety, depression, eating disorders, epilepsy and ADHD are more common in autistic people.
• A GP is the route to an assessment, and support may be available while waiting.

Frequently asked questions

Is autism an illness?

No. The NHS says autism is not an illness and has no cure, but there are ways to manage it and to get support.

Can an adult be autistic without a childhood diagnosis?

Yes. The NHS describes adults who have learned to mask their signs. Anyone who thinks they may be autistic can speak to their GP about an assessment.

Does every autistic person have a learning disability?

No. The NHS says some autistic people have a learning disability, and some have average or above-average intelligence.

This guide is for general information and is not a substitute for clinical advice or your organisation's policies.