Heat and pain relievers lead for cramps, while PMDD is a different problem

Key takeaways

• In a 2019 review of 38 studies and 21,573 young women, 71% had period pain and 1 in 5 had missed class because of it¹.
• In Cochrane’s review of 80 trials, about 18 in 100 women got moderate or better relief from a placebo, compared with 45 to 53 in 100 on anti-inflammatory pain relievers such as ibuprofen².
• Heat and regular exercise also eased cramps in trials, though most of those studies were small or low quality⁴⁵.
• Premenstrual dysphoric disorder (PMDD), a severe and treatable mood condition, affects roughly 1.6% to 3.2% of women and girls when diagnosed with daily symptom tracking¹⁰, and anyone having thoughts of suicide can call or text 988.
• In the main analysis of a Cochrane review, 43 to 63 in 100 women with heavy periods improved on tranexamic acid, which blocks enzymes that dissolve clots, compared with about 11 in 100 without treatment¹³.

In 2019, researchers at Western Sydney University pooled 38 studies of young women around the world, 21,573 in all¹. Seventy-one percent had period pain¹.

One in five had missed class because of it. Forty-one percent said the pain hurt their concentration or their work in class¹.

The team, led by Mike Armour, found that many young women simply endure it. One barrier to care is the belief that painful periods just come with growing up female¹. Another belief, that you’ll outgrow the pain, didn’t fit the data: pain was about as common among university students as among school students¹.

Cramps aren’t the only monthly problem. Premenstrual mood changes, heavy bleeding and migraines that arrive with a period can each take days out of a month.

The good news: the first-line fixes for cramps are cheap and well studied, and several drug-free approaches have real trial support. This article rates the options, natural and medical, and flags the symptoms that point to something more.

Cramps start with chemical messengers in the uterus

Painful periods have a medical name, dysmenorrhea. MedlinePlus, the National Library of Medicine’s consumer health site, describes two kinds³.

Primary dysmenorrhea starts around the time periods begin, in people who are otherwise healthy. Prostaglandins, hormone-like chemicals made in the uterus, are thought to drive the cramping³.

Secondary dysmenorrhea shows up later, in people whose periods used to be comfortable. It’s often tied to a pelvic condition such as endometriosis, fibroids, pelvic inflammatory disease or a copper IUD³.

That difference shapes everything below. Most remedies were tested on primary cramps. Pain that’s new, getting worse or unlike your usual pattern deserves a checkup, not just a stronger pill.

Pain relievers and heat: the cheapest fixes have the deepest trial records

Anti-inflammatory pain relievers. Nonsteroidal anti-inflammatory drugs (NSAIDs) include ibuprofen and naproxen. A 2015 Cochrane review pooled 80 randomized trials, studies in which people are assigned by chance to one treatment or another, with 5,820 women².

On a placebo, about 18 in 100 women got moderate or better relief. On an NSAID, 45 to 53 in 100 did². By our math, that’s 27 to 35 more women out of every 100.

Side effects were a little more common: about 11 to 14 in 100 women on NSAIDs, versus 10 in 100 on a placebo². NSAIDs beat acetaminophen in three trials, and no single NSAID clearly outperformed the rest².

Two cautions. The reviewers rated most of the evidence low quality because studies reported their methods poorly, and drug companies funded 59% of the trials². Still, the benefit was large.

MedlinePlus suggests starting one the day before your period is expected and taking it regularly for the first few days³.

Heat. This old home remedy has now been tested in dozens of trials. A 2025 review in Frontiers in Medicine pooled 57 randomized trials with 5,359 participants⁴. They used heating pads, stick-on warmers, infrared belts and moxibustion, a heat therapy from traditional Chinese medicine⁴.

Compared with no treatment, heat lowered pain by almost 2 points on a 10-point scale over three months⁴. Compared with NSAIDs, it eased pain about as well or slightly better, with fewer side effects⁴. The certainty was low for most pain results, because many trials weren’t blinded and publication bias was possible⁴. A Chinese medicine university and a provincial grant funded the review, and the authors reported no conflicts⁴.

MedlinePlus warns never to fall asleep with a heating pad on³. Our article on warm and cold compresses explains how heat can burn skin.

Movement, TENS and other drug-free options

Exercise. A 2019 Cochrane review led by Armour examined 12 trials with 854 women⁵. Programs ranged from stretching, core work and yoga to Zumba and aerobic training, usually 45 to 60 minutes at least three times a week⁵.

Compared with no treatment, exercise lowered pain by about 25 points on a 100-point scale, a drop the authors judged clinically meaningful⁵. The certainty was low, though, because trials were small and couldn’t hide from women which group they were in. Side effects were poorly reported⁵.

TENS. Transcutaneous electrical nerve stimulation uses a small device that sends mild electrical pulses through pads on the skin. In trials from an older Cochrane review, high-frequency TENS relieved period pain better than a sham device in three of four trials, while low-frequency settings didn’t⁶. Acupuncture beat sham acupuncture in one small trial⁶.

What didn’t hold up. Four trials with 206 participants pitted high-velocity spinal manipulation against a sham procedure. The largest and best-run trial found no clear benefit⁶.

Supplements. An older Cochrane review found small trials suggesting benefit from vitamin B1, magnesium, fish oil and a Japanese herbal formula⁶. Cochrane’s own complementary medicine group now calls those reviews outdated⁶. Ginger has newer trials, which our ginger article rates.

For readers who like to start gentle, this is encouraging. Heat and movement cost little and have trials behind them. The same evidence also tells you when gentle isn’t enough.

Birth control pills ease cramps, with trade-offs

Combined birth control pills contain estrogen and a progestin and suppress ovulation¹¹. A 2023 Cochrane review pooled 21 trials with 3,723 women⁷.

About 28 in 100 women improved on a placebo, compared with 37 to 60 in 100 on the pill⁷. Side effects came with it⁷:

• Irregular bleeding: 18 in 100 on placebo, 39 to 60 in 100 on the pill
• Headache: 17 in 100 versus 19 to 35 in 100
• Nausea: 10 in 100 versus 11 to 22 in 100

Manufacturers funded 11 of the 21 trials, and the review couldn’t say whether pills work better than NSAIDs⁷. It didn’t cover long-term effects⁷.

Whether a hormonal method fits you, and which one, is a decision to make with a clinician who knows your history. A later article on estrogen covers the small clot risk of estrogen-containing pills.

PMS is common, but PMDD is a different, serious condition

Premenstrual syndrome (PMS). The HHS Office on Women’s Health (OWH) says more than 90% of women notice some symptoms before their period, mostly mild, and as many as 3 in 4 report PMS at some point⁸. Symptoms range from bloating and breast tenderness to irritability, cravings and trouble sleeping⁸.

To call it PMS, clinicians look for symptoms in the five days before your period for at least three cycles in a row, ending within four days after bleeding starts, and getting in the way of daily life⁸. OWH suggests regular aerobic exercise, about eight hours of sleep and cutting back on caffeine, salt and sugar in the two weeks before a period⁸.

Premenstrual dysphoric disorder (PMDD). PMDD causes severe irritability, depression or anxiety in the week or two before a period, easing within two or three days after it starts⁹. Diagnosis requires five or more symptoms, at least one of them mood-related⁹. A daily symptom record kept across several cycles helps with diagnosis, which works partly by ruling out other conditions⁹¹¹.

A 2024 meta-analysis in the Journal of Affective Disorders pooled 44 studies and 50,659 participants¹⁰. When diagnosis was confirmed with day-by-day symptom tracking, 3.2% met the criteria¹⁰. In community samples with confirmed diagnoses, it was 1.6%¹⁰. By our math, that’s roughly 1 in 30 to 1 in 60.

Studies that relied on people’s recollection rather than daily tracking found 7.7%, which the authors say likely overstates the problem¹⁰. Careful tracking matters in both directions: it keeps PMDD from being dismissed, and keeps ordinary moodiness from being labeled a disorder.

In late 2023, the American College of Obstetricians and Gynecologists (ACOG) published a clinical practice guideline on premenstrual disorders¹¹. It recommends SSRI antidepressants as the first-line medicine, taken daily or only in the second half of the cycle, along with cognitive behavioral therapy, a structured talk therapy¹¹. Combined pills are recommended too, though they may not help mood¹¹.

OWH notes that the FDA has approved three SSRIs, sertraline, fluoxetine and paroxetine, plus one pill containing drospirenone and ethinyl estradiol, for PMDD⁹. ACOG also tells clinicians to watch for suicidal thoughts in people taking SSRIs¹¹.

Sadness or despair, sometimes with thoughts of suicide, is among PMDD’s symptoms⁹. If you’re thinking about suicide, call or text 988, the Suicide and Crisis Lifeline, any time. OWH says to call 911 if you’re thinking of hurting yourself or others⁹.

Heavy flow is defined by what it does to your life

England’s National Institute for Health and Care Excellence (NICE) doesn’t define heavy flow by the milliliter. Its heavy-bleeding guideline counts any blood loss heavy enough to disrupt a woman’s physical, social, emotional or material quality of life¹⁴.

It’s a common reason to see a doctor. In England, about 1 in 20 women ages 30 to 49 consult a family doctor each year about heavy or problem periods, NICE says¹⁴.

The trials in the Cochrane review below used a stricter line: more than 80 mL per cycle¹³. By our math, that’s about 5 tablespoons. Our iron article lists the CDC’s signs of heavy bleeding and explains how it drains iron stores.

Tranexamic acid reduces bleeding by blocking enzymes in the uterine lining that dissolve blood clots¹³. A 2018 Cochrane review of 13 trials with 1,312 women found it cut blood loss by about 53 mL per cycle compared with a placebo¹³.

In the review’s main analysis, if 11 in 100 women improve without treatment, 43 to 63 in 100 improve on tranexamic acid¹³. The review’s plain-language summary gives a smaller gain, 11 versus 36 in 100, so treat the exact size with some caution¹³. In lower-quality comparisons, it also beat NSAIDs and progestin pills taken in the second half of the cycle¹³.

It looked less effective than the hormonal IUD, which releases a progestin inside the uterus: in one small trial, about 85 in 100 improved with the IUD versus 20 to 65 in 100 with tranexamic acid¹³. The trials were too small to tell whether it raises clot risk¹³. Which option fits depends on your history and goals, a choice to make with a clinician.

Migraines that arrive with your period

Some migraines cluster from two days before a period to three days after it starts, in at least two of every three cycles¹⁵. Migraine & Headache Australia, a patient-support group, says the main trigger is the drop in estrogen at that time¹⁵. These attacks tend to last longer, hit harder and resist treatment more than other migraines¹⁵.

Clinicians can offer short courses of preventive medicine timed around a predictable period¹⁵. If you get migraine with aura, visual or other warning symptoms before the headache, tell your clinician before starting an estrogen-containing pill, because the two together raise stroke risk¹⁵.

OWH notes that PMS can worsen migraines and that magnesium may help⁸. Our magnesium article covers the migraine evidence and safe amounts.

The period symptom plan

This plan is our own, built from the sources cited in each row. Bring it to an appointment along with your symptom log.

Symptom	First steps	Evidence rating	See a clinician if
Usual cramps	An NSAID as the label directs; heat on the lower belly234	Strong evidence (NSAIDs); Promising but early (heat)	Treatment hasn’t relieved the pain after 3 months3
Cramps, drug-free	Exercise at least three times a week; high-frequency TENS56	Promising but early	Pain starts more than 5 days before your period or continues after it3
Cramps plus fever, unusual discharge or sudden severe pain	Don’t wait it out3	Not a self-care situation	Right away3
PMS	Track symptoms for 2 to 3 cycles; aerobic exercise; sleep; less caffeine, salt and sugar8	Promising but early	Symptoms bother you or affect daily life8
PMS supplements	Calcium; chasteberry only if you take no hormonal medicines81112	Promising but early	Before starting any supplement, especially if pregnant or on other medicines812
PMDD	Daily symptom log; SSRIs, CBT or pills through a clinician911	Strong evidence	Mood symptoms disrupt your life; for thoughts of suicide, call or text 9889
Heavy flow	Note how much it disrupts your days14; ask a clinician about tranexamic acid or other treatment13, and whether to check your iron	Strong evidence (tranexamic acid vs. placebo)	Bleeding disrupts your physical, social or emotional life14

When symptoms point to something more

MedlinePlus lists signs that call for prompt care³:

• Contact a clinician right away for fever with pelvic pain, more or foul-smelling vaginal discharge, or sudden or severe pain, especially if your period is more than a week late and you’ve been sexually active³.
• Make an appointment if you pass clots, if you have pain and your IUD was placed more than 3 months ago, or if pain shows up at other times of the month³.

Endometriosis and fibroids are among the conditions behind painful periods that start later in life³. Later articles cover endometriosis and the reproductive symptoms that need prompt assessment. If you feel brushed off, a symptom log and a clear request for a workup can help.

Questions readers ask

The bottom line

Period pain is common, but it isn’t something you have to wait out. Pain relievers have the strongest record, and heat and exercise have trials behind them, so a gentle start is reasonable. Hormonal options help too, with side effects worth weighing.

PMDD is a real, treatable condition, distinct from ordinary PMS, and a daily symptom log is the best first step. Heavy flow counts when it shapes your life, not just when it hits a number. When pain or bleeding changes, or comes with fever or unusual discharge, get it checked.

Related reading

• What a normal menstrual cycle looks like, and why it counts as a vital sign
• More People Now Qualify as Low in Iron. Find the Cause Before the Pill
• Magnesium Moves Bowels and May Prevent Migraines. Weak Kidneys Change the Math
• Heat loosens and cold numbs, and either one can injure skin if left on too long
• What to say when a doctor isn’t taking you seriously

Sources

1. Western Sydney University, NICM Health Research Institute. “Women missing class and missing out due to period pain.” News release on Armour M, et al., Journal of Women’s Health, July 1, 2019. westernsydney.edu.au
2. Marjoribanks J, et al. “Nonsteroidal anti-inflammatory drugs for dysmenorrhoea.” Cochrane Database of Systematic Reviews, 2015, Issue 7. cochrane.org
3. MedlinePlus, U.S. National Library of Medicine. “Painful menstrual periods.” Reviewed May 29, 2026. medlineplus.gov
4. Yuan D, Liu Y, Chen Z, et al. “Heat therapy for primary dysmenorrhea: a systematic review and meta-analysis.” Frontiers in Medicine, 2025;12. frontiersin.org
5. Armour M, Ee CC, Naidoo D, et al. “Exercise for dysmenorrhoea.” Cochrane Database of Systematic Reviews, 2019, Issue 9. cochrane.org
6. Cochrane Complementary Medicine. “Menstrual Pain” (summaries of Cochrane reviews of herbal and dietary therapies, spinal manipulation, and TENS and acupuncture). cam.cochrane.org
7. Schroll JB, Black AY, Farquhar C, Chen I. “Combined oral contraceptive pill for primary dysmenorrhoea.” Cochrane Database of Systematic Reviews, 2023, Issue 7. cochrane.org
8. HHS Office on Women’s Health. “Premenstrual syndrome (PMS).” Updated September 26, 2025. womenshealth.gov
9. HHS Office on Women’s Health. “Premenstrual dysphoric disorder (PMDD).” Updated September 26, 2025. womenshealth.gov
10. Reilly T, et al. “The prevalence of premenstrual dysphoric disorder: Systematic review and meta-analysis.” Journal of Affective Disorders, 2024;349:534–540 (PubMed abstract). pubmed.ncbi.nlm.nih.gov
11. American College of Obstetricians and Gynecologists. “Management of Premenstrual Disorders.” ACOG Clinical Practice Guideline No. 7, Obstetrics & Gynecology, 2023;142(6):1516–1533 (guideline summary, Wolters Kluwer NursingCenter, March 6, 2025). nursingcenter.com
12. National Center for Complementary and Integrative Health. “Chasteberry: Usefulness and Safety.” Updated April 2025. nccih.nih.gov
13. Bryant-Smith AC, Lethaby A, Farquhar C, Hickey M. “Antifibrinolytics for heavy menstrual bleeding.” Cochrane Database of Systematic Reviews, 2018, Issue 4. cochrane.org
14. National Institute for Health and Care Excellence. “Heavy menstrual bleeding: assessment and management” (NG88), Context chapter. NICE (UK Government Web Archive copy, captured May 5, 2026).
15. Migraine & Headache Australia. “Hormonal Headaches & Menstrual Migraine.” Updated July 1, 2020. headacheaustralia.org.au