Ovulation pain (mittelschmerz): causes and when to get help
Ovulation pain is pain on one side of the lower abdomen around the time an ovary releases an egg, and its medical name, mittelschmerz, is German for "middle pain". It usually lasts from a few minutes to a few hours, sometimes a day or two, and it is not harmful in itself, but other conditions can cause a similar pain.
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Bleeding and cramping are common in early pregnancy and often do not mean miscarriage. The symptoms below, however, need to be assessed straight away.
- Soaking two or more sanitary pads per hour, or passing large clots
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- Pain at the tip of the shoulder
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Get urgent advice for tummy pain that is severe and has not eased with painkillers, that keeps coming back, or that comes when you think you may be pregnant: the NHS says to ask for an urgent GP appointment or contact its urgent advice service (NHS, 2026). Mayo Clinic advises contacting a healthcare professional if new pelvic pain becomes severe, comes with nausea or fever, or does not go away (Mayo Clinic, 2025). The box above shows the emergency and urgent numbers for where you are, and get help now lists the symptoms in early pregnancy that need checking straight away.
This guide describes ovulation pain; it cannot say what is causing yours. MedlinePlus notes that other conditions can cause a similar pain, some of them more serious and in need of treatment, and advises discussing any pain with a health care provider (MedlinePlus, 2025).
What is ovulation pain?
Ovulation pain, or mittelschmerz pain, is one-sided pain in the lower abdomen at or around the time an ovary releases an egg (MedlinePlus, 2025). The name is German for "middle pain", because it comes midway through the menstrual cycle, about 14 days before the next period (Mayo Clinic, 2025). It can affect anyone who ovulates (NHS, 2026).
How common painful ovulation is depends on the source. MedlinePlus says one in five women have pain around the time of ovulation (MedlinePlus, 2025), and Cleveland Clinic says mittelschmerz may affect up to 40 in 100 people who ovulate (Cleveland Clinic, 2023). Mayo Clinic notes that some people have it every month and others only sometimes, and that it may be more likely between the ages of 15 and 25 (Mayo Clinic, 2025). MedlinePlus states that it can be painful but is not harmful and is not a sign of disease (MedlinePlus, 2025).
What does ovulation pain feel like?
The NHS describes ovulation pain as a dull pain or sharp, sudden twinges (NHS, 2026). Mayo Clinic says it can be dull and achy, like menstrual cramps, or sharp and sudden (Mayo Clinic, 2025), and MedlinePlus describes a sharp, cramping pain unlike other pain (MedlinePlus, 2025). That is why many people describe it as ovulation cramps, or cramps during ovulation. The mittelschmerz symptoms these sources list are:
- pain low in the abdomen, on one side only
- a dull ache or sharp, sudden twinges
- pain that begins midway through the cycle
- pain that may switch sides from month to month
- sometimes a little vaginal bleeding or discharge
- severe pain only rarely
The list draws on the NHS (NHS, 2026), MedlinePlus (MedlinePlus, 2025) and Mayo Clinic (Mayo Clinic, 2025). What do ovulation cramps feel like for most people? The US Office on Women's Health describes them more mildly, as minor cramping on one side of the pelvis that some women feel when they ovulate (Office on Women's Health, 2025).
How long does ovulation pain last?
| Source | How long it lasts |
|---|---|
| NHS | From a few minutes to 1 or 2 days |
| MedlinePlus | Minutes to a few hours; it can last up to 24 to 48 hours |
| Mayo Clinic | Often a few minutes to a few hours, sometimes a day or two |
| Cleveland Clinic | Typically a few hours, up to 48 hours |
The four sources agree closely (NHS, 2026; MedlinePlus, 2025; Mayo Clinic, 2025; Cleveland Clinic, 2023). Pain that lasts longer than usual for you, or that changes, is one of the reasons MedlinePlus gives for contacting a provider (MedlinePlus, 2025).
Where is ovulation pain felt?
The ovulation pain location is low in the abdomen, on one side, the same side as the ovary releasing the egg (Mayo Clinic, 2025). The NHS says it only affects one side of the tummy at a time and switches sides depending on which ovary releases an egg (NHS, 2026). MedlinePlus adds that it may switch sides from one month to the next, or stay on the same side for many months in a row (MedlinePlus, 2025).
Ovulation pain on the right side
Ovulation pain on the right side means the right ovary released the egg that cycle. The side can change the next month or stay the same for several months (MedlinePlus, 2025).
Ovulation pain on the left side
Ovulation pain on the left side means the egg came from the left ovary. There is no difference in what it means between the two sides; the pattern follows which ovary is active (Mayo Clinic, 2025). Pain that does not fit the usual timing or feel for you is a reason to get it checked, whichever side it is on.
Why ovulation causes pain
The NHS says pain during ovulation is caused by the ovary releasing the egg (NHS, 2026). Mayo Clinic states that the exact cause is not known, and both it and MedlinePlus give two likely explanations (Mayo Clinic, 2025; MedlinePlus, 2025):
- just before ovulation, the growing follicle that holds the egg stretches the surface of the ovary
- at ovulation, fluid or blood released from the ruptured follicle irritates the lining of the abdomen
Cramping after ovulation
Ovulation pain can come just after ovulation as well as just before or during it (MedlinePlus, 2025). Pain at any other point in the cycle is not mittelschmerz, Mayo Clinic says; pain during a period, for example, may be ordinary menstrual cramping (Mayo Clinic, 2025). Cramps after ovulation sometimes prompt questions about implantation, which, if a pregnancy has started, happens between about 6 and 12 days after ovulation (NICHD, 2026). Cramps cannot show whether that has happened. The guide to implantation bleeding covers the timing.
Ovulation pain and getting pregnant
MedlinePlus notes that mittelschmerz may help women be aware of the time in the cycle when the egg is released (MedlinePlus, 2025). For getting pregnant, though, that awareness comes late. ACOG says you can become pregnant from sex from 5 days before ovulation until 1 day after it (ACOG, 2019), and in a study of 221 women the chance of conception rose from about 10 in 100 for sex five days before ovulation to about 33 in 100 on the day itself (Wilcox et al., 1995). Pain that comes during or after ovulation arrives at the end of that window.
Searches for ovulation pain and pregnancy success suggest that the pain itself is a good sign. The sources cited here give no evidence that having ovulation pain, or how strong it is, predicts pregnancy. The signs that come earlier, such as changes in cervical mucus and a positive LH test, are more useful for timing; the guides to ovulation symptoms and the most fertile days explain them, and the ovulation calculator gives a starting estimate from your cycle length.
When ovulation pain needs a doctor
The NHS says always get medical advice for tummy pain that does not get better after taking painkillers or keeps coming back, and to ask for an urgent GP appointment or contact its urgent advice service if you have tummy pain and (NHS, 2026):
- the pain is severe and painkillers have not helped
- the pain keeps coming back
- you think you may be pregnant
MedlinePlus advises contacting a provider if ovulation pain seems to change, lasts longer than usual, or comes with vaginal bleeding (MedlinePlus, 2025). Mayo Clinic adds severe new pelvic pain, pain with nausea or fever, and pain that does not go away (Mayo Clinic, 2025).
Several conditions can cause pain similar to ovulation pain. The NHS lists (NHS, 2026):
- conditions that affect the womb or ovaries, such as endometriosis and ovarian cysts
- some sexually transmitted infections, such as chlamydia
- scar tissue (adhesions) from surgery near the ovaries, such as a cesarean section
- an ectopic pregnancy
People who search for endometriosis ovulation pain are often trying to tell the two apart. The sources cited here give no way to do that at home; a doctor may arrange tests or refer you to a specialist (NHS, 2026). Severe ovulation pain is not the usual pattern, since MedlinePlus describes severe pain as rare (MedlinePlus, 2025).
Easing ovulation pain
MedlinePlus says treatment is usually not needed (MedlinePlus, 2025). If ovulation is the only cause of the pain and it is not severe, the NHS suggests a warm bath or painkillers such as paracetamol (acetaminophen in the US) or ibuprofen (NHS, 2026). A GP may advise contraception that stops ovulation, such as the contraceptive pill or implant (NHS, 2026), and MedlinePlus and Mayo Clinic also describe birth control pills being used to prevent midcycle pain (MedlinePlus, 2025; Mayo Clinic, 2025). Which option suits you, and at what dose, is a question for your doctor or pharmacist.
This guide is information, not a diagnosis or a recommendation of treatment, and it is no substitute for your own clinician. See the medical disclaimer.
Sources
- NHS. Ovulation pain. nhs.uk, 2026.
- National Library of Medicine, MedlinePlus. Mittelschmerz. MedlinePlus Medical Encyclopedia, 2025.
- Mayo Clinic. Mittelschmerz: Symptoms and causes. mayoclinic.org, 2025.
- Cleveland Clinic. Ovulation Pain (Mittelschmerz). my.clevelandclinic.org, 2023.
- Office on Women's Health, US Department of Health and Human Services. Your menstrual cycle. womenshealth.gov, 2025.
- American College of Obstetricians and Gynecologists. Fertility Awareness-Based Methods of Family Planning (FAQ024). ACOG, 2019.
- Wilcox AJ, Weinberg CR, Baird DD. Timing of sexual intercourse in relation to ovulation: effects on the probability of conception, survival of the pregnancy, and sex of the baby. New England Journal of Medicine 333(23): 1517-1521, 1995.
- Eunice Kennedy Shriver National Institute of Child Health and Human Development. Menstruation and Menstrual Problems. NICHD, 2026.
Frequently asked questions
Is ovulation painful for everyone?
No. MedlinePlus says one in five women have pain around ovulation (MedlinePlus, 2025), and Cleveland Clinic puts it at up to 40 in 100 people who ovulate (Cleveland Clinic, 2023). Some people feel it every month and others only sometimes (Mayo Clinic, 2025).
Does ovulation cause cramps?
It can. The NHS describes ovulation pain as a dull pain or sharp, sudden twinges, and Mayo Clinic says it can feel dull and achy, like menstrual cramps (NHS, 2026; Mayo Clinic, 2025). The US Office on Women's Health notes that some women feel minor cramping on one side when they ovulate (Office on Women's Health, 2025).
Does cramping during ovulation mean pregnancy?
No. Ovulation pain comes from the ovary releasing an egg (NHS, 2026), which happens in every ovulatory cycle, whether or not a pregnancy follows. The earliest a pregnancy can be found is with a test, most reliably from the first day of a missed period.
Is ovulation pain too late to conceive?
Not necessarily, but it is late in the fertile window. The window ends on the day of ovulation or the day after it (ACOG, 2019), and the pain can come just before, during or after ovulation (MedlinePlus, 2025). Sex in the days before ovulation gives the best chance.
Ovulation cramps vs implantation cramps: what is the difference?
Timing. Ovulation pain comes about 14 days before a period (NHS, 2026). Implantation, if a pregnancy has started, happens later, between about 6 and 12 days after ovulation (NICHD, 2026). Cramps on their own cannot show which is which; a pregnancy test can.