Women Can Reach 40 Before Anyone Realizes They Have ADHD. Hormones May Explain Why

For some women, ADHD does not suddenly appear in adulthood. Instead, the symptoms they have spent decades managing quietly become impossible to ignore. That is what happened to Kate Moryoussef, who was 40 when she finally received an ADHD diagnosis after recognizing the same traits in her daughter during lockdown.

Watching her daughter struggle with everyday tasks prompted Moryoussef to seek an assessment for herself. Within weeks, she discovered that the difficulties she had spent much of her life explaining away had a name. She had not suddenly developed ADHD at 40. She had spent four decades adapting to it.

Why So Many Girls With ADHD Go Unnoticed

The problem often starts during childhood, when ADHD can look very different in girls than it does in boys. Girls are more likely to display inattentive symptoms rather than the disruptive behavior that tends to attract attention in a classroom. A child who daydreams, forgets instructions or quietly struggles to concentrate can easily be overlooked while a child who constantly interrupts or leaves their seat is more likely to be assessed.

The numbers show how large that gap can become. Around 6% of girls aged 3 to 17 are diagnosed with ADHD, compared with 13% of boys, according to Cedars-Sinai. Girls who are diagnosed can also wait around five years longer than boys for that diagnosis. Developmental pediatrician Cesar Ochoa-Lubinoff described the problem bluntly, saying, “You don’t see these young people; they just sit in the back of the classroom, don’t cause trouble and often fall through the cracks.” He also pointed to “gender bias in the research and general thinking” as part of the explanation.

That quiet presentation can have consequences years later. A girl who learns to compensate may become the person who spends extra hours preparing, checks everything repeatedly, creates elaborate routines and works harder than everyone around her simply to keep up. From the outside, she can appear organized and successful. Internally, keeping everything together may require an exhausting amount of effort.

The Symptoms Can Get Blamed On Something Else

Women who were never assessed as children often spend years trying to understand why certain parts of everyday life feel harder than they seem to for other people. Their difficulties may be interpreted through other diagnoses or explained as personality traits, stress or a failure to stay organized. That can send the search for an answer in several different directions.

Obstetrician gynecologist Kelly Wiersema says many women have learned to compensate for their symptoms or hide them. She also says doctors may diagnose women with “anxiety, depression, fibromyalgia or chronic fatigue instead.” Those conditions can be genuine and may require treatment, but they do not necessarily explain the underlying attention difficulties.

For women who make it into adulthood without an ADHD diagnosis, the eventual assessment often happens much later than people might expect. Physician Patricia Quinn has put the average age of diagnosis for women who were missed during childhood at around 36 to 38. By that point, many have already spent years building coping strategies around symptoms they never had a name for.

Then Midlife Hormone Changes Can Turn Up The Volume

One reason ADHD can suddenly feel much more disruptive during midlife involves estrogen. The hormone plays several roles in the brain and helps regulate chemical messengers including dopamine, serotonin and acetylcholine. Those systems are involved in attention, motivation, mood and memory, all areas that can already be affected by ADHD.

As women approach menopause, estrogen levels change substantially. Menopause occurs at an average age of around 51, while the years beforehand can involve significant hormonal fluctuations rather than a smooth decline. Neuropsychologist Jeanette Wasserstein has written that estrogen “helps repair brain tissue and support the actions of key neurotransmitter substances, such as dopamine and acetylcholine.”

That connection has led researchers to investigate whether hormonal changes can expose ADHD symptoms that were previously manageable. Lotta Borg Skoglund, an associate professor at Uppsala University and leader of the GODDESS ADHD research group, says, “As estrogen vacillates wildly in perimenopause, many women find that their ADHD symptoms grow significantly worse.” Researchers consider this a leading explanation, but it is not yet a settled conclusion.

The Difference Between ADHD And Hormonal Brain Fog

The distinction can be especially important because perimenopause itself can cause symptoms that overlap with ADHD. Sleep problems, forgetfulness, mood changes and difficulty concentrating can all occur during the transition.

The key question is whether the difficulties are genuinely new or whether they have existed in some form for most of the person’s life. ADHD symptoms are generally chronic and appear across different settings, while perimenopause symptoms can fluctuate and may eventually change as the hormonal transition progresses.

That means a woman who suddenly develops concentration problems in her 40s should not automatically assume she has ADHD. But someone who remembers struggling with attention, organization and impulsivity since childhood may be looking at an older pattern that has become harder to manage.

An Iceland Study Found A Striking Age Gap

One of the more notable pieces of evidence comes from research using the SAGA cohort in Iceland. Researchers examined 5,392 women between the ages of 35 and 55, including 535 who reported an ADHD diagnosis. Their findings were published in European Psychiatry in 2025.

Severe perimenopausal symptoms were reported by 54.2% of women with ADHD compared with 30.1% of women without ADHD. Physical symptoms such as hot flashes and sleep problems showed an even larger difference, with severe symptoms reported by 30.4% of the ADHD group compared with 13.9% of the group without ADHD.

The timing was particularly striking. Severe symptoms peaked between ages 35 and 39 among the women with ADHD, while the peak came between 45 and 49 among women without ADHD. That creates a difference of roughly a decade in when the most difficult symptoms appeared.

The researchers did not establish that ADHD causes earlier or more severe perimenopause. The study instead found an association between ADHD and the timing and severity of reported perimenopausal symptoms. That distinction matters when interpreting the findings.

The Research Still Has Some Big Gaps

The Iceland research offers an interesting signal, but it does not answer every question. The analysis looked at women at a particular point in time rather than following the same women throughout the entire menopausal transition. ADHD status was also self-reported, which means the researchers were relying on participants’ own reports of their diagnoses.

The study also involved one population in one country. Symptoms such as sleep problems, hot flashes and concentration difficulties can have multiple causes, so researchers cannot simply attribute every complaint to ADHD or hormonal changes.

Other surveys have limitations of their own. A CHADD poll involving roughly 4,000 women and a survey of nearly 5,000 ADDitude readers have been cited in discussions about ADHD and perimenopause. However, people who already read ADHD-focused publications are not necessarily representative of women as a whole.

So far, the evidence points toward a connection worth investigating rather than a simple explanation for every woman’s experience. The signal is becoming harder to ignore, while many of the details remain unresolved.

Hormone Therapy May Help Some Women, But The Evidence Is Limited

Treatment is another area where the gap between personal experience and strong scientific evidence becomes important. In the CHADD survey, roughly one-third of women said they had tried hormone replacement therapy. Among those women, about one-quarter reported finding it useful.

That does not establish hormone therapy as a treatment for ADHD. It means some women reported improvement after trying it, while many others did not. The research remains too limited to turn those experiences into a universal treatment recommendation.

Wasserstein has described the problem directly, saying “there is little awareness of these issues and almost no research to guide physicians and healthcare providers.” Moryoussef has also spoken about her own experience with hormone treatment, saying progesterone helped her and describing the days around ovulation before treatment as “horrendous.”

Her experience is useful context, but it remains one person’s experience. A treatment that helps one woman may not help another, and medication decisions should be based on an individual’s circumstances rather than an anecdote.

Three Clues That ADHD May Have Been There All Along

For women trying to make sense of sudden changes in their 30s, 40s or 50s, looking backward can sometimes provide more information than focusing only on the present symptoms.

• The difficulties started young: Problems with attention, organization, forgetfulness or impulsivity may have existed during school years, even if nobody recognized them as ADHD at the time.
• You have always relied on intense compensation: Spending far more time than others preparing, checking, organizing or recovering from everyday tasks can conceal symptoms without eliminating them.
• The symptoms worsened during hormonal changes: A long-standing pattern that suddenly becomes much harder to control during perimenopause may indicate that hormonal fluctuations are amplifying existing ADHD traits.

None of those signs proves that someone has ADHD. They can, however, give a doctor useful information when discussing whether an assessment makes sense.

The Diagnosis May Come Late Because The Coping Strategies Worked

Moryoussef’s story illustrates a pattern that can be easy to misunderstand. A woman may spend decades functioning well enough on paper while using enormous amounts of energy to compensate for problems that other people never see.

That can change when life becomes more demanding or when hormonal shifts add another layer of symptoms. Sleep becomes harder. Concentration becomes less reliable. Memory feels different. The systems that once kept everything under control stop working as efficiently as they did before.

Wiersema describes one clue that can help doctors distinguish the patterns: “They may find that symptoms were mild before and worsen during the perimenopause and menopause period.” That distinction gives women something concrete to discuss rather than simply accepting that worsening concentration is an unavoidable part of getting older.

Moryoussef did not develop ADHD at 40. She discovered it at 40, after circumstances finally made the pattern visible. For women who have spent years wondering why ordinary tasks require so much effort, that difference can change the question from “Why can’t I cope?” to “Could there be an explanation for this?

Sources:

• Pelham, V. (2025, November 20). Why ADHD goes undetected in girls. Cedars-Sinai. https://www.cedars-sinai.org/blog/why-adhd-goes-undetected-in-girls.html
• Does menopause cause ADHD? – CHADD. (2024, June 21). CHADD. https://chadd.org/attention-article/does-menopause-cause-adhd/