Autism (ASD) in Adults

Autism Spectrum Disorder (ASD) is a lifelong neurodevelopmental condition that affects how a person communicates, relates to others, and experiences the world. It is described as a spectrum because every autistic person has their own profile of strengths and support needs.

In 2022, around 290,900 Australians (1.1% of the population) were reported to be autistic, although the true number is likely to be higher. Many autistic adults were not identified as children — particularly women, and people whose autistic traits were less visible or who learned to mask them.

This page is about autism in adults. For information about assessment, see our adult autism assessment page. For young people, see Autism (ASD) in Children & Teens.

Autism is diagnosed based on differences in two areas: social communication and interaction, and restricted or repetitive patterns of behaviour, interests, or activities. In adults, this may look like:

• Finding conversation, small talk, or unwritten social rules confusing or tiring.
• A strong preference for routine and predictability, and distress when plans change unexpectedly.
• Deep, focused interests.
• Sensory differences — heightened or reduced sensitivity to sound, light, touch, smell, or crowds.
• Needing time alone to recover after social situations.

Many adults have learned to mask or camouflage autistic traits to fit in. Masking can make autism less visible to others, but it is often exhausting and has been linked to later diagnosis, especially in women.

Autism has a strong genetic basis. A large study following around two million children across five countries, including Western Australia, estimated that around 80% of the likelihood of autism is explained by inherited genetic factors.

There is no single cause of autism. Large studies involving millions of children have found no link between vaccines and autism, and autism is not caused by parenting.

Being autistic brings strengths as well as challenges. Without understanding and the right supports, autistic adults may experience:

• Challenges at work or study, particularly in environments that are not autism-friendly.
• Difficulties in relationships or social situations.
• Fatigue or burnout from masking and from managing sensory and social demands.
• Co-occurring conditions, such as anxiety, depression, or ADHD.

For many adults, a diagnosis helps make sense of past experiences and supports self-understanding and access to the right supports.

Autism in Australia is diagnosed in line with the National Guideline for the Assessment and Diagnosis of Autism, using the DSM-5 or ICD-11 criteria. For adults, assessment typically includes:

• A detailed clinical interview about current strengths and challenges.
• A developmental history — with consent, input from a parent or someone who knew you as a child can help.
• Standardised assessment tools, where appropriate.
• Consideration of co-occurring or alternative explanations, such as ADHD, anxiety, or depression.

For more about the assessment process, see our adult autism assessment page.

Autism is not something that needs to be cured, and there is no medication that treats autism itself. Support focuses on wellbeing and on what matters to the individual, and may include:

• Understanding your own autistic profile, strengths, and needs.
• Practical strategies and reasonable adjustments at work, study, and home.
• Psychological support, for example for anxiety, depression, or burnout.
• Medication, where appropriate, for co-occurring conditions such as anxiety, depression, ADHD, or sleep difficulties.
• Information about funding and services, such as the NDIS, where eligible.

Autism services for adults at Mindscape Psychiatry are provided by our experienced clinicians — see the clinicians listed on this page.

• Respectful, neurodiversity-affirming care focused on understanding your strengths as well as your challenges.
• Comprehensive assessment in line with Australia's national guideline.
• Support for co-occurring conditions such as anxiety, depression, or ADHD.
• Accessible Australia-wide via secure telehealth.

A valid GP referral is required.