Period pain has been compared to the pain of a heart attack. That’s not hyperbole from a blog post. Professor John Guillebaud at University College London’s Institute for Women’s Health has stated that menstrual cramps can reach the same intensity as a myocardial infarction. For many people, this validates what they’ve experienced for years without being taken seriously.
Of course, not every period feels like a cardiac event. Pain exists on a wide spectrum, and most people with periods fall somewhere between “barely noticeable” to “can’t get out of bed.” Understanding where your pain sits on that spectrum, and why it happens, can help you make sense of what your body is doing each month.
How Period Pain Ranks on the Pain Scale
When researchers measure menstrual pain using a 0-to-10 scale (where 10 is unbearable), the results split into three clear groups. People with mild cramps average around 1.7. Those with moderate pain land near 5.0. And those with severe period pain score an average of 8.9, which puts them in the same territory as kidney stones, broken bones, and yes, heart attacks.
More than half of all people who menstruate experience some level of pain for one to two days each cycle. For most, it stays mild. But for a significant portion, the pain is severe enough to stop them from going about their normal day for several days each month. A large survey of nearly 33,000 women published in BMJ Open found that about 14% reported missing work or school during their periods, with the average adding up to 1.3 lost days per year. Among students, that number climbed to 1.6 days per year.
What Period Pain Actually Feels Like
The sensation is driven by the same basic mechanism behind labor contractions. Your uterus is a muscular organ, and during your period it contracts to shed its lining. The body releases hormone-like compounds called prostaglandins to trigger those contractions. In people with painful periods, the uterine lining produces significantly more of these compounds than normal, causing the muscle to contract harder and more erratically. This squeezes the blood vessels feeding the uterus, temporarily cutting off oxygen. That oxygen deprivation is what creates the cramping pain, similar to how reduced blood flow to the heart causes chest pain during a heart attack.
The feeling itself is usually a deep, aching pressure in the lower abdomen that comes in waves. It can radiate into the lower back and down the inner thighs. Australian health guidelines describe early labor contractions as starting off feeling like period cramps, which gives you a sense of the overlap. The nerve pathways carrying pain signals from the uterus are the same ones involved in early-stage labor, which is why the two sensations feel so similar.
It’s Not Just Cramps
One of the most misunderstood aspects of period pain is that it rarely shows up alone. The same prostaglandins causing uterine contractions circulate through your bloodstream and affect your entire digestive system. About one in four people with painful periods report diarrhea, constipation, or both. Nearly 24% experience vomiting. Roughly 20% deal with heartburn or indigestion. Headaches, dizziness, and nausea are also common.
This cluster of symptoms is part of why period pain can feel so overwhelming. It’s not a localized ache you can push through. It’s a full-body experience that can leave you sweating, nauseated, and unable to concentrate, all at once.
When Pain Signals Something Deeper
There’s an important distinction between two types of period pain. Primary dysmenorrhea is the “normal” kind with no underlying disease. It typically lasts 4 to 48 hours, peaks on the first or second day of your period, and tends to start within a year or two of your first cycle.
Secondary dysmenorrhea is period pain caused by a condition like endometriosis, fibroids, or adenomyosis. The key differences: it tends to last longer (one to five full days), it can occur outside your period as well as during it, and it often gets worse over time rather than staying stable. With endometriosis, tissue similar to the uterine lining grows in other areas of the pelvis. These lesions trigger their own inflammatory reactions and release additional pain-causing compounds, layering extra pain on top of the normal cramping.
If your period pain has changed significantly, lasts well beyond two days, or has started interfering with your daily life in ways it didn’t before, that pattern is worth investigating. Pain that escalates year over year is a hallmark of secondary causes rather than typical menstrual cramping.
Why Period Pain Is Often Dismissed
Part of the reason the heart attack comparison resonated so widely is that menstrual pain has been historically undertreated. Pain that would prompt immediate medical attention in other contexts, scores of 7, 8, or 9 out of 10, has been routinely waved off as a normal part of having a period. The reality is that pain severe enough to keep you home from work or school is not something you’re expected to simply tolerate. Effective treatments exist, ranging from anti-inflammatory medications that directly reduce prostaglandin production to hormonal options that thin the uterine lining and lower the amount of inflammatory compounds released each cycle.
Knowing that your pain registers on the same scale as some of the most recognized painful experiences in medicine isn’t just validating. It’s practical information you can use to communicate clearly with a healthcare provider about what you’re actually going through.