Is It Your ADHD, Your Cycle or Your Gut?

Is It Your ADHD, Your Cycle or Your Gut?

Why Tracking Helps You Narrow It Down

By Rafaela Buena, founder of Gigi.

Some weeks everything slips at once. The fog rolls in. Starting anything feels impossible. Your patience is gone, and your stomach is bloated, crampy and unpredictable. The easiest story is that your ADHD is having a bad week.

Sometimes that story is exactly right. But for a lot of women, several things are happening at the same time, and they tend to arrive together. This post is about one overlap that rarely comes up in ADHD support: the gut. And about why the most useful move is not to guess harder, but to collect a little evidence.

The gut and ADHD show up together more often than you would expect

Researchers are increasingly noticing that ADHD and gut complaints travel together.

In a study published this year in the Scandinavian Journal of Gastroenterology, researchers offered ADHD and autism screening to 150 adults with moderate to severe irritable bowel syndrome (IBS). 110 completed it, 86 of them women. 45 of the 110 screened positive for ADHD traits, and that group reported more severe IBS symptoms. A positive screen is a flag, not a diagnosis, but it is a strong one.

Two recent meta-analyses point the same way. One, published in Scientific Reports in 2025, pooled 11 studies and about 3.85 million people, including roughly 175,000 with ADHD, and found people with ADHD were about 1.6 times more likely to have IBS. A larger review from the University of Warwick, published in September 2026 in the Journal of Attention Disorders, pooled 23 studies and more than 1.9 million people. It linked ADHD to 58% higher odds of IBS and nearly double the odds of constipation.

It is worth being honest about the limits. These studies show the two often occur together, not that one causes the other, and not every researcher is convinced: UCLA gut-brain researcher Emeran Mayer has openly criticised how mixed the underlying studies are. Some ADHD medications can also cause digestive side effects such as constipation, and most of the studies did not separate people on medication from people without it.

Add one more fact: IBS is roughly twice as common in women as in men. So if you are a woman with ADHD and your gut has opinions, you are far from alone.

Same hormones, same week

Here is where it gets interesting for women specifically. ADHD symptoms and gut symptoms both respond to the same hormonal shifts, and they tend to peak in the same window.

On the ADHD side. Oestrogen supports dopamine, the brain chemical at the centre of ADHD. When oestrogen drops in the days before your period, many women notice that focus, motivation and emotional regulation get harder. In a preliminary study, University of Kentucky psychologist Michelle Martel followed 97 female college students across their cycles and found ADHD symptoms worsened just before and during their period, when oestrogen is low. Some participants only met the criteria for ADHD at certain points in their cycle. Closer to home, Dutch researchers including psychiatrist Dora Wynchank of the Expertise Centre ADHD in The Hague have described women reporting stronger symptoms and weaker stimulant effects premenstrually, and earlier Dutch work found that women with ADHD experience severe premenstrual mood symptoms (PMDD) more often and more intensely.

On the gut side. Bloating, abdominal pain and changes in bowel habits increase in the days before and during menstruation, and again around perimenopause, in women with and without IBS. In one study, bloating worsened premenstrually in up to two thirds of women with IBS. Researchers point to the same thing: falling oestrogen and progesterone.

Put those together and you get a week where the fog, the overwhelm, the bloating and the bad sleep all land at once. From the inside, it all just feels like "my ADHD is worse". Perimenopause is another window to watch: falling oestrogen in this phase has been linked to more severe ADHD symptoms, and gut symptoms often shift then too.

Why the science is still catching up with women

The gut microbiome is one of the most promising areas of ADHD research, and also one of the least settled. One of the largest studies in adults, published in 2021, compared 100 medication-free adults with ADHD to 100 matched controls and found differences in several bacterial families, but results across studies remain inconsistent.

There is also a familiar gap. A 2022 review in the journal Women pointed out that research on ADHD and the gut has been largely male-centric, or simply has not analysed sex as a factor at all. That matters, because women and girls are diagnosed with ADHD less often than men and boys, partly because assessment tools were built around the hyperactive behaviour more typical of boys. And women's gut symptoms move with a monthly cycle that many studies do not account for.

The result: women are often left to connect the dots on their own.

Tracking does not diagnose. It narrows the possibilities.

When everything feels connected, it is hard to know where to start. Tracking is how you turn a fog of possibilities into a shorter list. A few weeks of simple notes can start to answer questions like these:

• Does the brain fog arrive on the same days as the bloating, or independently of it?
• Does it cluster in the days before your period?
• Does it follow skipped meals, a late coffee, or a short night?
• Did it change when something else changed, like new medication, a new routine or a stressful project?

Two or three cycles is usually enough to see whether something repeats. That is not a diagnosis, and it is not meant to be. It is something concrete to bring to your GP, your coach or a specialist, so the conversation starts from your actual pattern instead of a vague "I just feel worse lately". If you want help working out which biological factors are worth raising with your GP, nutritionist Nerys Williams Giuliani works with exactly this.

The ADHD tracking paradox

There is a catch, and if you have ADHD you have probably already spotted it. Tracking asks for daily consistency, which is exactly what ADHD makes hard. Most apps assume you will open them every day and fill in a form. Then life happens, you miss three days, and the app quietly ends up in a folder you never open.

A few things that make it more realistic:

• Track less. Three signals, for example energy, gut and cycle day, beat fifteen you abandon.
• Attach it to something you already do, like your first coffee or brushing your teeth.
• Talk instead of type. A voice note takes ten seconds.
• Forgive the gaps. Patchy data still shows patterns. Perfect data you never collect shows nothing.

Where Gigi comes in

This paradox is exactly why I am building Gigi.

Gigi is an AI wellness companion built for women. Instead of asking you to fill in forms, she lets you talk to her the way you would talk to a friend about your day. She keeps your gut, food, mood, energy, reactions, sleep and cycle together in one place and, over time, helps you see the patterns between them. The ones that are easy to miss when you are living inside them.

She is grounded in evidence reviewed by our clinical team, with priority given to research that was actually done on women. She does not diagnose, and she is designed to point you to professional care when something sounds like it needs it. The aim is simple: to help you understand what your body has been trying to tell you, and to arrive at your next appointment with clarity instead of guesswork.

Gigi is currently in pilot. You can join the waiting list at talktogigi.ai

This article is for general information and is not medical advice. If your symptoms are new, severe or worrying you, please speak to your GP.