A few months ago, people around me started saying "maybe you have ADHD. You're starting things and not finishing them." I started to wonder. Then I thought it might be perimenopause. It turned out my stored iron was rock bottom. I had no ferritin at all.

A lot of what looks like ADHD in women is iron deficiency, thyroid trouble, perimenopause, or some combination of the three. Some of it is ADHD. Some of it is both, because low ferritin makes existing ADHD much worse.

This checklist will help you notice patterns that might be ADHD. It will not diagnose you. And it will not rule out the other things that mimic it, so the final section of this guide tells you what else to ask your GP about.

Tick what you recognise. Print what you tick. Take it with you.

What ADHD symptoms in women actually look like

A generation of women are being diagnosed with ADHD in their 30s and 40s, often after a life change pushes them past what their coping strategies can hold. The image most people carry of ADHD, a boy who cannot sit still, came from research done almost entirely on boys. Inattentive and combined presentations in girls were overlooked for decades, because being quiet in class is not a disruption anyone is paid to notice.

The NHS and NICE now acknowledge that adult women are under-diagnosed. Waiting lists reflect that. The dominant female profile tends to combine inattentive traits, chronic task paralysis, time blindness, rejection sensitivity, and emotional regulation difficulties, held together by masking that works until it suddenly does not. A steady drip of "you're so capable, you're just not applying yourself" follows women from primary school into their careers. The gap between what you can achieve when interest or panic carries you and what you can achieve on an ordinary Tuesday is where most of the distress lives.

Why ADHD in women gets missed for decades

School reports said "bright but careless" or "distracted" or "could try harder". In the teenage years, the same traits get recoded as anxiety and depression, and those are the diagnoses you leave sixth form with. Twenties are "just stress" and "everyone feels like that". Thirties and forties are when something shifts, often a baby, a promotion, a divorce, or perimenopause, and the coping that held for twenty years stops working.

I was diagnosed at 41. What I had spent my whole life calling laziness, disorganisation, or "being bad at adulting" turned out to have a name and a shape. The diagnosis did not fix anything overnight. What it did was stop the running commentary in my head that I was the problem. If you are a woman recognising yourself in the inattentive presentation, you are not alone in getting here late. You are part of a cohort.

ADHD symptoms in women that might actually be something else

Before you walk in and ask for an ADHD referral, it is worth knowing what else can produce the exact symptoms on the checklist above. Four conditions dominate the picture.

Iron deficiency, especially low ferritin with normal haemoglobin. Ferritin is stored iron, and it can be depleted well below the level a standard NHS blood test flags as "low". A normal full blood count does not rule it out. Low ferritin produces fatigue, poor concentration, brain fog, and emotional volatility, the cluster of symptoms most often mistaken for ADHD in women with heavy periods or recent pregnancies.

Thyroid dysfunction. An underactive thyroid mimics inattentive ADHD almost exactly: slowed thinking, low energy, poor memory, difficulty focusing. Ask for TSH, free T4, and ideally free T3, not just TSH on its own.

Perimenopause. Oestrogen supports dopamine activity in the brain. As oestrogen declines from the mid-30s onward, attention, working memory, and executive function are often the first things to go. This is a significant reason so many women are diagnosed with ADHD in their 40s: the hormones that propped up their coping quietly withdrew.

B12, folate, and vitamin D. Less discussed but genuinely common. Deficiency in any of these affects concentration, mood, and cognitive function enough to be mistaken for ADHD.

My own story is a ferritin story. Self-diagnosing ADHD is cheap. Self-ruling-out the things that mimic it is expensive. Ask for the bloods.

How to get an ADHD diagnosis as a woman in the UK

The route starts with your GP. Book a double appointment if the surgery allows it, take the printed checklist, and be explicit about what you are asking for: an assessment for adult ADHD, and the bloodwork to rule out the conditions that look like it.

From there, you have three paths. The NHS assessment route is free but slow; waiting lists for adult ADHD assessments in many areas now run into years. Right to Choose lets you ask for an NHS-funded assessment through an independent provider of your choice, often with much shorter waits. Fully private assessment is the fastest route but costs between £1,000 and £2,500 depending on provider. Private reports can be accepted by the NHS for ongoing shared care, though some ICBs are now refusing shared care agreements. Check your local position before you pay.

You can search for assessment providers in the Neuroequipped directory.

What to say to your GP about ADHD as a woman

Use this, verbatim if it helps:

I've been noticing a pattern of symptoms that could be ADHD. I've completed a checklist and ticked [X] out of 20 items, which I've brought with me. Before we discuss an ADHD referral, I'd also like to rule out iron deficiency, thyroid dysfunction, and perimenopause. Can we arrange bloodwork for ferritin, a full iron panel, thyroid function including free T3, B12, folate, and vitamin D?

If the answer is "it's just stress" or "it's just your hormones", that is a reason to ask for a second opinion, not to drop it.

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This article is part of the Neuroequipped ADHD guide. For the interactive checklist, scroll up. For the full hub, see ADHD guides.

Neuroequipped provides research-grounded information for parents and adults navigating neurodivergence. It is not medical advice. If you have concerns about your health or your child's, speak to your GP.