Recognising the Signs of Autism in Adults: Symptoms, Diagnosis, and How to Get Tested

Zoom in shot of angry young wife at autism assessment

Autism isn’t just something that affects children. Many adults are only beginning to understand that the challenges they've faced for years could be linked to undiagnosed autism. Recognising the signs of autism in adults can be life-changing, helping people better understand themselves and find the right support.

In this blog, we’ll explore the common autism symptoms in adults, what adult autism diagnosis involves, and how to get tested for autism in adults.

What Is Autism Spectrum Disorder (ASD)?

Autism spectrum disorder (ASD) is a lifelong condition that affects how people experience the world, communicate, and interact with others. It's called a "spectrum" because it includes a wide range of symptoms and levels of severity. While many people are diagnosed in childhood, some adults reach later stages in life without ever knowing they’re autistic.

Undiagnosed autism in adults can lead to challenges in relationships, work, and emotional well-being, often without a clear explanation until a diagnosis is made.

Common Signs of Autism in Adults

Social and Communication Difficulties

These are some of the most recognisable adult autism symptoms:

  • Struggling to keep up a conversation or understand jokes, sarcasm, or idioms
  • Finding eye contact uncomfortable or avoiding it altogether
  • Difficulty interpreting body language, facial expressions, or tone of voice
  • Speaking in a flat or robotic tone without emotional inflection
  • Feeling overwhelmed or anxious in social settings
  • Appearing blunt, quiet, or overly honest without intending to offend

Repetitive Behaviours and Routines

Many autistic adults have a strong need for structure and predictability:

  • Rigid daily routines that are difficult to change
  • Distress when plans or routines are unexpectedly altered
  • Repetitive movements like tapping, rocking, or fidgeting (also known as stimming)
  • Fixation on specific interests or topics
  • Sensory sensitivities (e.g., to light, sound, or touch)

Everyday Challenges

Some people show traits that might not seem obvious at first:

  • Feeling like social rules are confusing or illogical
  • Struggling to manage time, organise tasks, or plan ahead (executive function challenges)
  • Feeling different, misunderstood, or emotionally drained from masking symptoms to fit in
  • Trouble recognising when someone is upset or angry, including themselves

These symptoms of autism in adults can vary widely, and not every autistic person will experience all of them.

You may also like: ADHD vs Autism: Understanding the Key Differences and Overlaps

What About Autism in Women?

Autism symptoms in adult women can sometimes be less obvious. Many women mask or hide their traits to blend in socially. They might:

  • Copy social behaviours from others
  • Appear sociable, but feel anxious and exhausted afterwards
  • Suppress repetitive behaviours in public

This masking can delay an adult autism diagnosis, making it even more important to look beneath the surface.

How to Get Tested for Autism in Adults

Step 1: Self-Assessment

Online self-assessment tools can be a great place to start. While they can't give a diagnosis, they can help you decide if you should speak to a professional.

Step 2: Speak to Your GP

Take your concerns and any self-assessment results to your GP. They’ll ask about your developmental history, behaviours, and symptoms, and may refer you for a formal adult autism assessment.

Step 3: Specialist Assessment

This is typically carried out by a psychiatrist, psychologist, or autism specialist. They may use tools like the ADOS-2 assessment and talk to people who know you well. Diagnosis looks at your past and present behaviours.

If you’re looking for a private autism diagnosis, our team at Private Medical Clinic offers a straightforward and compassionate adult autism assessment process.

Explore: Book your private autism assessment today

Why an Adult Autism Diagnosis Matters

Getting a diagnosis can bring clarity and relief. It can help:

  • Explain the challenges you’ve experienced over the years
  • Improve relationships and communication with others
  • Unlock support at work or in education
  • Replace a previous misdiagnosis, like ADHD or anxiety

Some people may choose not to seek a diagnosis—and that’s okay, too. But for many, a diagnosis is the first step to better understanding themselves.

How to Deal with Autism Anger in Adults

Anger or emotional outbursts can happen when autistic people feel overwhelmed, unheard, or misunderstood. Here's how to help manage it:

  • Identify and reduce triggers (like sensory overload or routine changes)
  • Use calming strategies such as breathing techniques or time-out spaces
  • Consider therapy to build emotional regulation skills
  • Communicate openly with trusted people about your needs

FAQs About Autism in Adults

Can adults be autistic without knowing?

Yes. Many adults with mild or masked symptoms go undiagnosed until later in life.

What are the first signs of autism in adults?

Common early signs include social anxiety, difficulty with small talk, sensory sensitivities, and a need for routine.

Can autism appear later in life?

No — autism is a developmental condition present from early childhood. However, the signs may not become obvious until adulthood.

Is it worth getting an autism diagnosis as an adult?

For many, yes. A diagnosis can provide answers, unlock support, and improve self-awareness.

Final Thoughts

Recognising the signs of autism in adults can be the beginning of a more fulfilling and supported life. Whether you’re considering an autism diagnosis for yourself or a loved one, know that you’re not alone.

At Private Medical Clinic, we help with professional, judgment-free assessments and support. Book your adult autism assessment today and take the first step toward clarity and understanding.

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