Study reveals menstrual cycle's impact on ADHD symptoms in women

Layla's phone buzzes constantly throughout her day—four alarms to wake up, one to get dressed, another to pack her work bag, and dozens more scattered across the hours. At 30, the teaching assistant has learned that these digital markers are not overkill but necessity, the scaffolding that keeps her ADHD brain tethered to routine and focus. She describes it as hitting markers, small checkpoints that prevent her from drifting. But every month, without fail, that carefully constructed system collapses. As her period approaches, the control she has built evaporates. "It's like you're clinging on, for dear life, onto the ball that is continuing to roll," she says, "and sort of cursing yourself and the world the entire time."

Layla is not alone in this monthly struggle, though for years she had no framework to understand it. Across social media and online forums, women with ADHD have been describing the same pattern—symptoms that worsen dramatically during menstruation, medication that stops working, a cyclical disability that arrives with predictable cruelty. Now, for the first time, researchers at King's College and Queen Mary University in London are investigating whether this lived experience reflects a biological reality. They have recruited 50 women with ADHD who are on medication and asked them to track their menstrual cycles alongside their symptoms, documenting how their ability to concentrate, regulate emotion, and manage impulse shifts across the month.

The timing of this research reflects a broader shift in how ADHD is understood and diagnosed. Roughly 2.5 million people in the UK have ADHD, with hundreds of thousands more waiting for NHS assessment. Social media and growing awareness of how ADHD presents differently in women—often masked, often missed until adulthood—have created unprecedented demand for diagnosis. NHS figures from December 2025 showed a 23 percent increase in ADHD medication prescriptions compared to the year before. Yet a government taskforce report from November 2025 found the condition remains under-diagnosed and under-treated. Some areas of England have closed their NHS waiting lists entirely, unable to manage the volume of referrals.

Héloïse, 19, is studying for three university degrees. She describes her ADHD medication, Ritalin, as a lifeline—a pill that opens a three-hour window of focus, during which she can sit in the library and work. But during her period, she waits for the medication to take effect and nothing happens. "It feels like losing a walking stick or something you use to support yourself," she says. "All of a sudden it's broken." It was only when she began tracking her symptoms for the King's College study that she saw the pattern clearly: her medication simply did not work during certain phases of her cycle. Other women in the research described similar experiences, using language like "disabled" to capture how their symptoms intensified at particular times of the month.

Dr. Sally Cubbin, a psychiatrist and neurodiversity specialist involved in the study, explains the mechanism. Just before menstruation, when estrogen levels drop, the hormone affects dopamine—the brain's feel-good chemical—making ADHD symptoms significantly worse. The impact extends beyond focus and task management. "Women are also more likely to make dodgy decisions and take risks," Dr. Cubbin notes, citing examples like binge eating, impulsive spending, and even inconsistent contraception use. For Layla, this manifests as irresistible cravings. She loves pickles; during her period, she knows she will eat too many, feel ill, and be unable to stop herself even as it happens. "It's this impulse to do it and then once it's in your head it's really difficult to shut it down or turn it off," she explains.

The women in the study have kept electronic diaries documenting their hormonal changes and the severity of their ADHD symptoms—anxiety, depression, impulsive behavior—allowing researchers to map whether patterns emerge and whether medication effectiveness fluctuates across the cycle. Dr. Jessica Agnew-Blais, the lead researcher, emphasizes that this is new territory. Until the late 1990s, ADHD was understood as a childhood condition affecting mainly boys. The recognition that women experience ADHD differently, and that it often goes undiagnosed into adulthood, is recent. Dr. Catherine Durkin of the Royal College of Psychiatrists notes that increasing awareness has led more women to recognize their own struggles and seek help.

Women are also asking questions the current research is not yet equipped to answer: how does menopause affect ADHD? What about perimenopause, the years of hormonal transition leading up to it? Dr. Agnew-Blais suggests her study, still ongoing, could serve as a starting point for those conversations. The goal, she emphasizes, is not to change who women are but to help them fit ADHD into their lives more effectively. For Layla, participating in the research has been transformative. She has spent years blaming herself for not measuring up, for failing to maintain the discipline she demands of herself. Learning that this monthly pattern is something thousands of women experience, that it has a biological basis, has felt "validating and freeing." "It's good to have kind of community and feel like that it's okay, this isn't just me," she says.