Last month it was two ibuprofen and a walk. This month it is the bathroom floor. Same body, same calendar, wildly different day. If you are typing "why are my cramps worse this month" into your phone with the lights off, here is what actually changes between cycles, and what does not.
Cramps are a prostaglandin story
Period cramps come from prostaglandins, chemicals made in the uterine lining that make the muscle and blood vessels of the uterus contract. ACOG's explanation is the clearest we have found: prostaglandin levels are highest on the first day of a period and fall as the lining sheds, which is why day one is usually the worst and day three is usually fine. Anything that changes how much prostaglandin your lining makes, or how sensitive you are to it that month, changes the cramp.
7 reasons your cramps are worse this month
1. You were stressed last month, not this one. This is the finding that surprised us. A 2004 study followed 388 women across 1,160 cycles and found that high stress in the preceding cycle more than doubled the odds of painful cramps in the next one (odds ratio 2.4). Stress in the first half of the cycle mattered more than stress in the second. So the month that hurts is often the bill for the month before, which is worth knowing before you blame this week's workload.
2. You may not have ovulated. The textbook line was that cramps need ovulation, because the progesterone drop of a normal cycle sets up prostaglandin production. A 2024 analysis in the Journal of Pain Research compared 75 cycles and found the opposite: anovulatory cycles had longer cramps (4 days versus 3) and higher intensity. Travel, illness, a stretch of bad sleep, and stress can all produce a cycle without ovulation. That cycle may hurt more, not less. This is one study and the field is still arguing, so hold it loosely.
3. You have a new IUD. The NHS notes that an intrauterine device can cause period pain, particularly during the first 3 to 6 months after it goes in. If the timeline matches, this is probably your answer, and it usually settles.
4. You took the painkiller late. NSAIDs like ibuprofen and naproxen work by reducing the prostaglandins your body makes, and a Cochrane review of the trials calls them a very effective treatment for dysmenorrhoea, with real side effects to be aware of. ACOG's practical point is timing: they work best at the first sign of your period or pain. A month where you toughed it out until lunch is a month that hurts more than one where you took a dose with breakfast. Ask a pharmacist or doctor what is right for you.
5. You stopped the pill, or started it. A 2014 review in Epidemiologic Reviews pooled 15 large studies and found that oral contraceptive use was inversely associated with dysmenorrhea, along with age and having had children. Coming off hormonal birth control can mean the return of ovulatory cycles, and the first few can be loud. Going on it can quiet them.
6. You moved less. A 2019 Cochrane review of 12 trials and 854 women found that exercise, low intensity like yoga or high intensity like aerobics, may provide a large reduction in period pain compared with doing nothing. The review also says it is unclear whether the benefit lasts once you stop. Our honest reading: a month where the walks fell off may be a month where the cramps came back. We cannot prove that from the review, and we are not going to pretend we can.
7. It runs in the family, and you are still young. The same 2014 review put family history as the strongest risk factor of all, with odds ratios between 3.8 and 20.7. Age, on the other hand, is on your side: ACOG says primary dysmenorrhea often eases as women get older and may improve after giving birth. Neither explains a single bad month. Both explain why your baseline is what it is.
When "worse" is a pattern, not a month
A bad month is a bad month. A trend is different. ACOG describes secondary dysmenorrhea, pain caused by a condition in the reproductive organs, as pain that tends to get worse over time, often lasts longer, may begin days before a period, and may not go away after it ends. The usual causes are endometriosis, fibroids, adenomyosis, and pelvic inflammatory disease. If the last three or four periods have each been worse than the one before, that is not a stress month. That is an appointment.
In the meantime, what helps a bad month is the boring stuff done early: heat on the belly (our heating pad comparison covers what to buy), a painkiller at the first twinge if you use one, and food that leans anti-inflammatory rather than the takeout that is easiest to order.
Where we come in
We make Girl Chocolate, a dark chocolate bar with magnesium and other functional ingredients, for the days around your period. A pouch is eight bars, one cycle. It is made for your cycle, it supports PMS relief* and cramps*, and it is not a painkiller and does not pretend to be one. On a floor month it is the thing we reach for alongside the heat and the ibuprofen, not instead of them. The bar is at girlchocolate.co.
Sources
- ACOG: Dysmenorrhea, painful periods FAQ
- Wang 2004, Occup Environ Med: stress and dysmenorrhoea (PubMed)
- Mann 2024, J Pain Research: cramps in anovulatory versus ovulatory cycles
- NHS: Period pain
- Marjoribanks 2015, Cochrane: NSAIDs for dysmenorrhoea (PubMed)
- Ju, Jones and Mishra 2014, Epidemiologic Reviews: risk factors of dysmenorrhea
When to talk to a doctor
- Pain that stops you going to work, school, or doing your usual daily life.
- Bleeding through a pad or tampon every hour.
- Pain that suddenly got worse than your usual, or has been getting worse for three or more cycles in a row.
- Pain with a fever, or pain during sex, peeing, or bowel movements.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
