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Dysmenorrhea is painful menstruation. It is classified as either primary or secondary. Primary dysmenorrhea generally occurs within a couple of years of the first menstrual period. The pain tends to decrease with age and very often resolves after childbirth. Secondary dysmenorrhea is menstrual pain caused by another condition, commonly endometriosis. It starts later in life and tends to increase in intensity over time.

As many as half of menstruating women are affected by dysmenorrhea, and of these, about 10% have severe dysmenorrhea, which greatly limits activities for one to three days each month.1


Rating Nutritional Supplements Herbs
Vitamin B3 (niacin)
Vitamin B3 (niacin) (plus vitamin C and rutin)
Vitamin E
Fish oil (EPA/DHA)
Progesterone (topical cream)
Vitamin B1
Black cohosh
Blue cohosh
Cramp bark
Dong quai
False unicorn
Reliable and relatively consistent scientific data showing a substantial health benefit.
Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support and/or minimal health benefit.


What are the symptoms of dysmenorrhea?

Dysmenorrhea includes symptoms of abdominal bloating, frequent and intense cramps, pain below the waistline, or a dull ache that may radiate to the lower back or legs. There may also be symptoms of headache, nausea, diarrhea or constipation, frequent urination, and, occasionally, vomiting. The symptoms usually occur just before or during the menstrual period.

Dietary changes that may be helpful for dysmenorrhea

Some physicians advise that alcohol should be avoided by women experiencing menstrual pain, because it depletes stores of certain nutrients and alters the metabolism of carbohydrates—which in turn might worsen muscle spasms. Alcohol can also interfere with the liver’s ability to metabolize hormones. In theory, this might result in elevated estrogen levels, increased fluid and salt retention, and heavier menstrual flow.

Lifestyle changes that may be helpful for dysmenorrhea

Many women feel the need to lie still while experiencing menstrual cramps, while others find that exercise helps relieve the pain of dysmenorrhea. This variation from woman to woman may explain why some researchers report that exercise makes symptoms worse,2 though most studies report that exercise appears helpful.3

Nutritional supplements that may be helpful for dysmenorrhea

The niacin form of vitamin B3 has been reported to be effective in relieving menstrual cramps in 87% of a group of women taking 200 mg of niacin per day throughout the menstrual cycle. They then took 100 mg every two or three hours while experiencing menstrual cramps.4 In a follow-up study, this protocol was combined with 300 mg of vitamin C and 60 mg of the flavonoid rutin per day, which resulted in a 90% effectiveness for relieving menstrual cramps.5 Since these two preliminary studies were published many years ago, no further research has explored the relationship between niacin and dysmenorrhea. Niacin may not be effective unless taken for seven to ten days before the onset of menstrual flow.

In theory, calcium may help prevent menstrual cramps by maintaining normal muscle tone. Muscles that are calcium-deficient tend to be hyperactive and therefore might be more likely to cramp. Calcium supplementation was reported to reduce pain during menses in one double-blind trial,6 though another such study found that it relieved only premenstrual cramping, not pain during menses.7 Some doctors recommend calcium supplementation for dysmenorrhea, suggesting 1,000 mg per day throughout the month and 250–500 mg every four hours for pain relief, during acute cramping (up to a maximum of 2,000 mg per day).

Like calcium, magnesium plays a role in controlling muscle tone and could be important in preventing menstrual cramps.8 9 Magnesium supplements have been reported in preliminary10 and double-blind11 12 European research to reduce symptoms of dysmenorrhea. In one of these double-blind trials, women took 360 mg per day of magnesium for three days beginning on the day before menses began.13

Diets low in omega-3 fatty acids (EPA and DHA) have been associated with menstrual pain.14 In one double-blind trial, supplementation with fish oil, a good source of omega-3 fatty acids, led to a statistically significant 37% drop in menstrual symptoms. In that report, adolescent girls with dysmenorrhea took an unspecified amount of fish oil that provided 1,080 mg of EPA and 720 mg of DHA per day for two months to achieve this result.15 A double-blind trial found that the same amount of EPA and DHA plus 7.5 mcg per day of vitamin B12 led to a greater than 50% decrease in menstrual symptoms, but a group taking only fish oil did not obtain as much relief.16 Six grams of fish oil per day provides the approximate levels of EPA and DHA used in these trials.

In a double-blind trial, adolescents living in India who were suffering from dysmenorrhea took 100 mg of vitamin B1 (thiamine) per day for three months. Eighty-seven percent of those treated experienced marked relief of dysmenorrhea symptoms.17 However, vitamin B1 deficiency is relatively common in India, whereas it is rare in the Western world, except among alcoholics. It is not known whether vitamin B1 supplementation would relieve dysmenorrhea in women who are not B1 deficient.

In a double-blind trial, supplementation with 500 IU of vitamin E per day for two months, beginning two days before menstruation and continuing for three days after the onset of menstruation, was significantly more effective than a placebo at relieving menstrual pain.18

Some practitioners report success using topical progesterone cream for dysmenorrhea.19 To date, this approach lacks sufficient research.

Are there any side effects or interactions with dysmenorrhea?

Refer to the individual supplement for information about any side effects or interactions.

Herbs that may be helpful for dysmenorrhea

Corydalis contains several alkaloids, and one called tetrahydropalmatine (THP) is considered to be the most potent. In laboratory research, THP has been shown to exhibit a wide number of pharmacological actions on the central nervous system, including pain-relieving and sedative effects.20 According to a secondary reference, painful menstruation responded favorably to the administration of THP.21 For a pain-relieving effect, the recommended amount for the crude dried rhizome is 5–10 grams per day. Alternatively, one can take 10–20 ml per day of a 1:2 extract.

Cramp bark (Viburnum opulus) has been a favorite traditional herb for menstrual cramps, thus its signature name. Cramp bark may help ease severe cramps that are associated with nausea, vomiting, and sweaty chills. Research from animal studies shows that cramp bark blocks spasms of smooth muscle.22 Cramp bark is traditionally prepared by placing two teaspoons of the dried bark into a cup of water and bringing it to a boil; it is then simmered gently for 10 to 15 minutes. The tea may be drunk three times per day.23 Alternatively, 4–8 ml of tincture may be used three times per day.

Black cohosh has a history as a folk medicine for relieving menstrual cramps. Black cohosh can be taken in several forms, including crude plant, dried root, or rhizome (300–2,000 mg per day), or as a solid, dry powdered extract (250 mg three times per day). Standardized extracts of the herb are available, though they have primarily been researched for use with menopausal women suffering from hot flashes. The recommended amount is 20–40 mg twice per day.24 The best researched form provides 1 mg of deoxyactein per 20 mg of extract. Tinctures can are also used (2–4 ml three times per day).25 The Commission E Monograph recommends black cohosh be taken for up to six months, and then discontinued.26

Blue cohosh, although unrelated to black cohosh, has also been used traditionally for easing painful menstrual periods. Blue cohosh, which is generally taken as a tincture, should be limited to no more than 1–2 ml taken three times per day. The average single application of the whole herb is 300–1,000 mg. Blue cohosh is generally used in combination with other herbs. Women of childbearing age using this herb should cease using it as soon as they become pregnant—the herb was shown to cause heart problems in an infant born following maternal use of blue cohosh.27

False unicorn was used in the Native American tradition for a large number of women’s health conditions, including painful menstruation. Generally, false unicorn root is taken as a tincture (2–5 ml three times per day). The dried root may also be used (1–2 grams three times daily). It is typically taken in combination with other herbs supportive of the female reproductive organs.

Dong quai has been used either alone or in combination with other Traditional Chinese Medicine herbs to help relieve painful menstrual cramps. Many women take 3–4 grams per day. A Japanese herbal formulation known as toki-shakuyaku-san combines peony root (Paeonia spp.) with dong quai and four other herbs and has been found to effectively reduce symptoms of cramping and pain associated with dysmenorrhea.28

Vervain is a traditional herb for dysmenorrhea, however there is no research to validate this use. Tincture has been recommended at an amount of 5–10 ml three times per day.

Clinical reports from Germany have suggested that vitex may help relieve different menstrual abnormalities associated with premenstrual syndrome, including dysmenorrhea.29 These studies used 40 drops of a liquid preparation that delivers the equivalent of 40 mg of the dried berries of the plant.

Are there any side effects or interactions with dysmenorrhea?

Refer to the individual herb for information about any side effects or interactions.

Holistic approaches that may be helpful for dysmenorrhea

Relaxation techniques have been used with some success to alleviate dysmenorrhea in some young women. According to one preliminary study, the symptoms of menstrual cramps, nausea, irritability, and poor concentration greatly improved after 20-minute relaxation sessions twice per week.30

Acupuncture may be a useful therapy in the treatment of dysmenorrhea. A preliminary trial reported that 86% of women treated with acupuncture for dysmenorrhea had complete cessation of pain for three consecutive menstrual periods.31 Other preliminary trials have demonstrated similar results.32 33 34 A controlled clinical trial reported 91% efficacy with acupuncture compared to 36.4% efficacy with sham acupuncture (using fake acupuncture points) and 18% efficacy in an untreated control group.35 A small trial compared a 30-minute TENS (transcutaneous electrical nerve stimulation) treatment to stimulate acupuncture points with a placebo pill for dysmenorrhea. There was a large placebo effect in this study, and pain relief over the next several hours was not significantly better in the treatment group compared to placebo.36 More controlled trials are needed to determine whether acupuncture is a useful treatment for dysmenorrhea.

Spinal manipulation has been investigated as a treatment for dysmenorrhea. One small preliminary study reported improvement in symptoms measured by a questionnaire.37 A controlled clinical trial compared a single treatment of spinal manipulation to the low back and pelvis to a sham manipulation that was designed to be ineffective. Women receiving real manipulation reported twice as much relief as those receiving sham treatment.38 A recent, larger trial repeated the above study, testing a series of treatments over two months. Women reported less pain from both real and sham treatment, but there was no difference between the groups.39 Whether there is a real benefit from spinal manipulation for women with dysmenorrhea remains unclear at this time.