If you’ve ever felt that your symptoms weren’t taken seriously – with PMS, with unexplained pain, with “that’s just normal, you’re a woman” – you’re not alone, and it’s no coincidence.
It has a name: the gender data gap.
What the gender data gap means – in numbers
For decades, clinical trials were conducted mostly on male participants. This isn’t just a feeling; it’s a well-documented imbalance. Women make up about 51 percent of the population, yet to this day they account for only around 33 percent of clinical trial participants. In industry-sponsored early-phase trials – exactly where dosages and safety profiles are first established – the share of women is even below 30 percent. In cardiovascular trials, it averages just 25 to 40 percent. And even when women did take part, only around 35 percent of clinical trials worldwide analyze their results by sex at all.
That means even existing data on sex-specific differences often simply gets lost.
What this means in practice: the example of Zolpidem
This isn’t an abstract problem.
A well-known example is the sleep medication Zolpidem: women have a significantly higher risk than men of a “hangover” effect the next day – because the original dosage recommendation wasn’t adjusted for differences in female metabolism.
With heart attacks, there’s another issue: the “typical” symptoms (pain in the left side of the chest, radiating into the arm) are based on male study cohorts. Women often experience different signs, such as nausea, shortness of breath, or back pain, which are considered “atypical” and are therefore overlooked more often.
Endometriosis as a prime example
Nowhere is the gender data gap more visible than with endometriosis.
In the United States, endometriosis is estimated to affect around one in ten women of reproductive age. Some estimates put it as high as 15 percent. The real scandal lies in how long it takes to get a diagnosis. A frequently cited study found that women in the US waited an average of almost 12 years between their first symptoms and a diagnosis – significantly longer than women in the UK, who waited around 8 years.
During that time, endometriosis lesions can continue to spread, and many women are told: “Period pain is normal.”
Why things are finally starting to change
In 2026, the topic is more visible than it has been in a long time. In October 2026, a new executive order directed the National Institutes of Health (NIH) to set up a dedicated Women’s Health Division. It will work alongside the NIH’s existing Office of Research on Women’s Health to step up research on understudied women’s health conditions.
The National Academies of Sciences have gone even further: they recommend a separate NIH institute for women’s health research and $15.7 billion in new funding over five years. Women’s health organizations stress that only sustained funding will make a real difference.
But the marginal status that women’s health issues held for so long is slowly beginning to crumble.
What this means for your everyday life – in concrete terms
You don’t have to wait for the next study to trust your own experience. Here are a few things that genuinely help you get heard at the doctor’s office:
- Keep a symptom diary for at least 2–3 cycles (date, intensity on a scale, accompanying symptoms). It reveals a pattern that a single appointment can’t show.
- Describe symptoms in terms of lost function, not feelings. Instead of “I’m in a lot of pain,” try “On these days, I can’t work / can’t move.” In a medical context, that carries different weight.
- Actively seek a second opinion if you feel you’re not being taken seriously. It’s not a vote of no confidence – given the data situation described above, it’s simply sensible practice.
If your body is telling you that PMS isn’t “a little bit of a bad mood” for you, but a serious monthly burden – that’s not an exaggeration. It’s an experience that has been structurally minimized for a long time.
We developed our EFT Tapping Guide for PMS for exactly this monthly burden – not to help you “push through,” but to give your nervous system targeted relief in the days before your period, with scripts specifically for irritability, exhaustion, and emotional ups and downs.
Part of the Circle: This article is part of The Healing Circle. Structural problems are often framed as individual failure – and not just in medicine. Read more on Heal your Mind: Narcissism as the Dark Side of an Individualistic Society.
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