Why was my daughter diagnosed with anxiety instead of autism?

Often, autism is under-recognised in girls: many mask their traits and present with anxiety, so clinicians diagnose the anxiety and miss the autism. An anxiety diagnosis does not rule out autism; the two often co-occur. This is a recognised pattern, not a fringe theory. NICE's national guideline on diagnosing autism in under-19s states plainly that autism may be under-recognised in girls, and it lists anxiety both as a condition that can look like autism and as one that frequently sits alongside it.

Why autism gets missed in girls

The picture clinicians were trained to spot was largely built around boys. Autistic girls are more likely to mask — copying other children, staying quiet when they struggle and holding themselves together in public — so the obvious signs do not show up in a short clinic appointment. The National Autistic Society notes that many professionals have had less training in how autism looks in girls, that some assessment tools are less sensitive to it, and that girls are often given a mental-health label such as anxiety while the autism behind it goes unrecognised. Autism is still diagnosed around three times more often in boys than girls (a roughly 3:1 ratio), and researchers think a large part of that gap is girls being missed.

An anxiety diagnosis does not rule out autism

This is the point most search results skip. Getting an anxiety diagnosis is not the same as autism being ruled out. The two commonly go together, and for many autistic girls the anxiety is not a separate problem at all — it is what unrecognised, masked autism feels like from the inside. A child working hard to copy everyone else, dreading change and managing sensory overload all day will look anxious, because she is. The anxiety is real and worth treating in its own right. But treating the anxiety alone may not resolve it if autism is the thing underneath.

That matters for what you do next:

• Keep the anxiety support going. Asking about autism does not mean the anxiety diagnosis was wrong or that her current help should stop.
• Treat persistent anxiety as a flag. Anxiety that does not respond to treatment is itself a recognised reason to look harder for an autism explanation.
• You can ask for an autism assessment. Because NICE itself names girls as under-recognised, pushing for an assessment is backed by national guidance, not just a parent's hunch.

How to ask for an autism assessment

Speak to your GP about a referral to your local autism assessment team, and write down the home picture the clinic may not see — the after-school meltdowns, the masking, how long the anxiety has lasted. If you have already had an assessment and disagree with the outcome, the NHS says you can ask the team why, ask your GP or the team to refer you to a different team for a second opinion, or arrange an independent assessment. If finding the anxiety diagnosis hard to move past with one GP, you can ask to speak to another.

If your daughter is struggling badly with low mood, severe anxiety, self-harm or thoughts of not wanting to be here, you do not need an autism answer first to get her help. Talk to your GP, contact the YoungMinds Parents Helpline on 0808 802 5544, or in a crisis call NHS 111 and choose the mental health option, call Samaritans on 116 123, or text SHOUT to 85258.

This page is general information, not clinical or legal advice.