Reviewed against NHS, ACOG, and peer-reviewed clinical guidance.
Ovulation pain comes from the ovary releasing an egg: a one-sided ache lasting minutes to 1 or 2 days that may affect over 40% of women.
Ovulation pain happens because the ovary releasing an egg triggers a one-sided ache or twinge, usually lasting from a few minutes to 1 or 2 days, according to the NHS. Known medically as mittelschmerz, it may affect over 40% of women of reproductive age and is rarely a sign of anything serious.
This article draws on NHS guidance on ovulation pain, a 2023 StatPearls clinical review of mittelschmerz, a 2013 Fertility and Sterility study of LH surges, the WHO endometriosis fact sheet, and American College of Obstetricians and Gynecologists (ACOG) guidance, current as of November 2026.
What Causes Pain During Ovulation?
Pain during ovulation is linked to the surge in luteinising hormone (LH) that releases the egg, rather than simply the follicle stretching the ovary. The 2023 StatPearls review explains that the LH rise increases contractions of smooth muscle around the follicle through prostaglandins, the same chemical messengers behind period cramps.
The review describes mittelschmerz as "a benign preovulatory lower abdominal pain that occurs midcycle (between days 7 and 24) in women." It usually starts a few years after a first period, once ovulation becomes regular, and is felt near the ovary that is releasing the egg that month. Rising oestrogen (estrogen) drives ovulation, which is why other ovulation signs, such as clear, stretchy cervical mucus, often appear on the same days. Those signs are covered in the guide to the 7 signs of ovulation.
Is It Normal to Get Ovulation Pain Every Month?
Yes, it is normal to get ovulation pain every month, and the StatPearls review notes it occurs almost every month in women who have it. The NHS says it often switches sides depending on which ovary releases an egg, and some women notice light bleeding or discharge at the same time.
Pain on the left side in September, the right in October and the left again in November fits the usual pattern of the ovaries taking turns. The side does not always alternate neatly, because either ovary can release the egg in any cycle. Many women ask whether it is normal for the pain to feel sharp, and the NHS describes it as anything from a dull ache to sharp, sudden twinges.
Solu is a women's wellness app that maps cycle-phase-aware guidance across movement, nutrition, sleep, and energy, built for women tracking hormonal, cycle, and premenstrual symptoms. Noting mid-cycle twinges in Solu's symptom log over several cycles shows whether the pain lands at the same point each month.
How Can You Tell Ovulation Pain From Something Else?
Ovulation pain is usually mild, one-sided, short-lived and timed about 14 days before a period, while pain from other causes tends to be severe, persistent or unrelated to the cycle. The NHS lists endometriosis, ovarian cysts, sexually transmitted infections such as chlamydia, scar tissue and ectopic pregnancy as conditions that can feel similar.
| Feature | Typical ovulation pain | Worth checking |
|---|---|---|
| Timing | About 14 days before a period | Any time, or keeps coming back |
| Duration | Minutes to 1 or 2 days | Not easing with painkillers |
| Location | One side, may switch | Spreading or both sides |
| Severity | Dull ache or brief twinges | Severe pain |
| Pregnancy | Not possible | Possible pregnancy |
Pain that is severe, persistent or possible during pregnancy needs a medical check, not watchful waiting. The WHO estimates endometriosis affects about 10% of reproductive-age women, and lists chronic pelvic pain that continues after a period as a symptom.
Does Ovulation Pain Mean You Are Fertile?
Ovulation pain signals that ovulation is likely happening around that time, but it is too variable to pinpoint the fertile window on its own. The StatPearls review notes the pain coincides with the peak in LH, before the follicle ruptures, so it can come slightly before ovulation rather than at the exact moment.
A rough estimate works backwards from the next period: ovulation falls about 14 days before it, so a 30-day cycle points to day 16 and a 26-day cycle to day 12. The 2013 study of 107 women over 283 cycles found LH surges were extremely variable in shape, size and length, so no single sign is exact. Solu's view of where each day sits in the cycle places the ovulation phase alongside those other signs. The fertile window itself is explained in when women are most fertile, and the late-cycle question in whether fertility is possible 2 to 3 days before a period.
When Should You See a Doctor About Ovulation Pain?
Ask for an urgent GP appointment or call NHS 111 if mid-cycle pain is severe and painkillers have not helped, keeps coming back, or might be linked to pregnancy. As of 2026, NHS guidance says tummy pain that does not improve with painkillers or keeps returning should always be checked. Mild pain usually settles with a warm bath, paracetamol or ibuprofen.
Go to emergency care for sudden severe pain with a positive pregnancy test, or with fainting. ACOG warns that a ruptured ectopic pregnancy can cause major internal bleeding, a life-threatening emergency needing immediate surgery. Book a routine appointment for very painful periods or pelvic pain that lasts beyond the period, which can point to endometriosis.
Key Takeaways
- Ovulation pain lasts from a few minutes to 1 or 2 days and usually affects one side, according to the NHS.
- A 2023 StatPearls review estimates mittelschmerz may affect over 40% of women of reproductive age.
- The pain is linked to the LH surge and prostaglandins, and often comes slightly before the egg is released.
- Severe pain, pain that keeps returning or pain during a possible pregnancy needs urgent medical advice.
Related Reading
Ready to feel the difference?
