Why Are Women With ADHD Diagnosed So Late?

Short answer

In one Swedish study of health records, women with ADHD were first recorded about four years later than men (Skoglund et al., 2024). A 2026 review says ADHD gets missed because girls' symptoms look different and bias shapes who gets referred (Risa et al., 2026). Late diagnosis tended to come with more mental health problems (Risa et al., 2026). In six of eight studies in one review, women said they felt relief and more self-acceptance after diagnosis (Attoe & Climie, 2023).

Key facts

• Boys get an ADHD diagnosis 3 to 16 times more often than girls. In adults, the gap narrows to between 1:1 and 3:1 (Risa et al., 2026).
• Girls and women with ADHD are about twice as likely as boys and men with ADHD to be diagnosed with anxiety or depression. They're also more often treated for those first (Risa et al., 2026).
• In Norway, the share of girls aged 16 to 19 with an ADHD diagnosis in specialist health care doubled from 1.5% in 2019 to 3.1% in 2022 (Norwegian Institute of Public Health, 2023).

A woman in an online discussion wrote: “It made me so mad that so many of us go undiagnosed for so long.”

Some women spend years thinking they are disorganized, exhausted, or “too much,” while doctors treat anxiety or depression first. A 2026 review looked at the reasons.

About four years later, in one Swedish study

Risa and colleagues screened 1,729 articles from 2021 to 2024 and reviewed 60 of them. One Swedish register study, by Skoglund and colleagues, covered 85,330 people with ADHD in Stockholm County. In it, women were first recorded with an ADHD diagnosis or ADHD medication at 23.5 years on average. Men were first recorded at 19.6, a gap of about four years (Skoglund et al., 2024). In childhood, boys are diagnosed 3 to 16 times more often than girls.

Why girls and women get missed

The review names these obstacles to catching ADHD earlier (Risa et al., 2026):

What a late diagnosis comes with

The same review reports that women diagnosed late tended to have more comorbid (co-occurring) mental disorders, more relationship difficulties, and a higher suicide risk. That held even when compared with men who have ADHD (Risa et al., 2026).

A systematic review (a structured search and summary of earlier studies) of eight studies on adult women adds the personal side. Women without a diagnosis described low self-esteem, self-blame, and strained relationships. In six of the eight studies, women said they felt relief and more self-acceptance after diagnosis (Attoe & Climie, 2023).

Norway's rising diagnosis numbers

The Norwegian numbers come from specialist health care, and most of the rise came during the pandemic years. The Norwegian Institute of Public Health lists greater awareness as one possible reason, among others. The numbers can't tell us whether the women still being missed differ from the women now getting diagnosed.

ADHD and the menstrual cycle

Newer research from 2025 and 2026 asks whether ADHD and the menstrual cycle affect each other. The evidence is early. The studies below are surveys, reviews, and register data (health records), not trials.

• A screening result pointing to PMDD (a severe form of premenstrual mood symptoms) was more common in women with ADHD, in a survey of 715 women aged 18 to 34. It showed up in 31.4% of women who said they had an ADHD diagnosis and 41.1% of women whose answers met an ADHD symptom threshold. Among women without ADHD, it was 9.8% (Broughton et al., 2025). A screening questionnaire isn't a diagnosis.
• Women with ADHD said they had more irregular periods in a survey of 602 women, 377 of them with self-reported ADHD (Boyd et al., 2026).
• A 2026 review calls PMDD cycle-specific and ADHD cycle-responsive, meaning ADHD symptoms shift with the cycle. Both are described as worse in the luteal phase, the second half of the cycle. The researchers link this to changes in ovarian hormones and in brain chemicals such as serotonin and dopamine. The review is a discussion of brain-imaging research, built around PMDD. It isn't a test in people with ADHD (May et al., 2026).
• Swedish register data on 104,972 women diagnosed with a premenstrual disorder showed that the 54,796 with no earlier psychiatric diagnosis were later diagnosed with ADHD at about 3.6 times the rate of matched women. Women with the disorder also had about twice the odds (a way of comparing how likely something is) of an earlier ADHD diagnosis (Zhou et al., 2026).

Together, these results point to a link between the two. The surveys recruited women online, and the register data are health records, so none of them can tell us which came first.

What the research can’t tell us

• The 2026 review is narrative, meaning it sums up studies in words instead of pooling their numbers. Its authors say the flexible way they chose articles makes it hard for anyone else to repeat, and they didn't rate how good the studies were.
• The studies it covers define and measure ADHD in different ways.
• The systematic review rests on small samples, on what women said about themselves, and on childhood memories. Its authors couldn't separate biological sex from gender (Attoe & Climie, 2023).
• The research doesn't show how much each of these obstacles adds to late diagnosis.

When should you talk to a professional?

Only a clinician can diagnose ADHD, and a blog post or quiz can't. If this sounds like you, look for one who knows adult ADHD. Examples from childhood and from your life now help, and so does mentioning any anxiety or low mood, since they often come with ADHD.

Where Soula can fit in

If you're collecting examples for a clinician, some people find it helps to put their days into words regularly, so you are not trying to remember a whole year. Soula, an emotional companion for women, offers check-ins and a chat with an AI assistant for this, and cycle tracking that shows where a hard week falls in your month. It doesn't diagnose or treat ADHD, and it encourages you to seek clinical care when you need it.

FAQ

Why did nobody notice my ADHD when I was a girl?

Partly because girls' symptoms are easier to overlook. The review says parents and teachers report more symptoms in boys, and girls and women tended to need more of them before a clinician considered an assessment (Risa et al., 2026).

Is it normal to feel relief after a late diagnosis?

Some women do. Relief and more self-acceptance after diagnosis came up in six of eight studies in one review, while women without a diagnosis described low self-esteem and self-blame (Attoe & Climie, 2023).

Can ADHD feel worse before my period?

Possibly. A 2026 review describes ADHD symptoms as shifting with the cycle and being worse in the luteal phase, the second half. It builds on PMDD research, though, and wasn't a test in people with ADHD (May et al., 2026).

Why are women diagnosed with ADHD later than men?

The review points to several obstacles, including: symptoms that look different in girls, adults who notice boys first, anxiety and depression that get treated first, and masking. Its authors say masking is probably one of the most important reasons diagnosis comes late or gets missed (Risa et al., 2026).

Can you be diagnosed with ADHD as an adult?

Yes. The reviews above cover many women who got their diagnosis in adulthood, often after years of other explanations. A clinician experienced in adult ADHD can assess you.

Is ADHD different in women than in men?

It can look different, with quieter hyperactivity in girls. Researchers argue that the way ADHD is diagnosed today may be biased toward how it shows up in males (Attoe & Climie, 2023; Risa et al., 2026).

What do women with undiagnosed ADHD often experience?

In the eight studies reviewed, women described low self-esteem, self-blame, difficult relationships, and a feeling of having no control. Only a clinician can tell whether ADHD explains these experiences.

Does a late diagnosis affect mental health?

Late diagnosis tended to come with more comorbid mental disorders, more relationship difficulties, and a higher suicide risk (Risa et al., 2026). These are patterns reported across studies, so we can't tell whether the delay itself led to them.

References

1. Risa M, Selvikvaag MEH, Gorecka MM, Sonuga-Barke E, Raudeberg R. Main challenges to diagnosing ADHD in females: a narrative review. Tidsskrift for Norsk psykologforening. 2026. Link
2. Attoe DE, Climie EA. Miss. Diagnosis: a systematic review of ADHD in adult women. Journal of Attention Disorders. 2023;27(7):645–657. https://doi.org/10.1177/10870547231161533
3. Skoglund C, Sundström Poromaa I, Leksell D, et al. Time after time: failure to identify and support females with ADHD, a Swedish population register study. Journal of Child Psychology and Psychiatry. 2024. https://doi.org/10.1111/jcpp.13920
4. Norwegian Institute of Public Health (FHI). Økning i ADHD-diagnoser for barn og unge under pandemien. 2023. https://www.fhi.no/nyheter/2023/okning-i-adhd-diagnoser-for-barn-og-unge-under-pandemien/
5. Broughton T, Lambert E, Wertz J, Agnew-Blais J. Increased risk of provisional premenstrual dysphoric disorder (PMDD) among females with attention-deficit hyperactivity disorder (ADHD): cross-sectional survey study. British Journal of Psychiatry. 2025;226(6):410–417. https://doi.org/10.1192/bjp.2025.104
6. Boyd C, Wrigley M, Kilbride K, Mulligan A, Bramham J. ADHD and the female reproductive stages: menstruation, perinatal and menopause. Archives of Women's Mental Health. 2026;89. https://doi.org/10.1007/s00737-026-01718-x
7. May E, Comasco E, Tiepolt S, et al. Timing matters: leveraging positron emission tomography imaging and hormonal cycles for precision psychiatry in female mental health. Biological Psychiatry. 2026;713–727. https://doi.org/10.1016/j.biopsych.2026.01.021
8. Zhou J, Muse Z, Bränn E, et al. Bidirectional association between premenstrual disorders and psychiatric disorders. JAMA Network Open. 2026;e2611765. https://doi.org/10.1001/jamanetworkopen.2026.11765