Evidence behind this recommendation.
Selected studies from our library that inform the recommendations on this page. Evidence grade shown when available.
Moxibustion for pain relief in patients with primary dysmenorrhea: A randomized controlled trial
“This study showed that moxibustion is as effective as medications for menstrual pain during treatment, but its benefits last longer.”
Regulatory Effects of Acupuncture on Emotional Disorders in Patients With Menstrual Migraine Without Aura: A Resting-State fMRI Study
“This study showed that acupuncture can help women with menstrual migraine reduce both pain and symptoms of anxiety and depression.”
What Is Dysmenorrhea?
Dysmenorrhea (menstrual cramps) is a condition characterized by intense, cramping pelvic pain that occurs immediately before or during menstruation. It is the most prevalent gynecologic disorder among women of reproductive age, affecting between 50% and 90% of adolescents and young adults.
Primary dysmenorrhea occurs without identifiable pelvic pathology and is related to excessive production of prostaglandins (especially PGF2-alpha and PGE2) by the endometrium. These substances cause intense myometrial contractions, vasoconstriction of the uterine artery, and ischemia of uterine tissue — generating the characteristic pain that can be disabling.
When conventional pharmacologic treatments are insufficient or cause unwanted side effects, medical acupuncture emerges as a complementary therapeutic option with growing scientific evidence for menstrual pain control.
Highly Prevalent
Affects up to 90% of women at some point in their reproductive lives, and is the leading cause of school and work absenteeism among young women.
Recurrent
Occurs with each menstrual cycle and can last 48 to 72 hours, significantly compromising quality of life.
Treatable
Medical acupuncture can reduce pain intensity, decrease analgesic use, and improve functioning during the menstrual period.
Why Conventional Treatments Are Not Always Sufficient
Nonsteroidal anti-inflammatory drugs (NSAIDs) and hormonal contraceptives are the mainstays of conventional treatment for dysmenorrhea. NSAIDs work by inhibiting cyclooxygenase (COX) and reducing prostaglandin synthesis, but have important clinical limitations: about 20%–25% of patients do not obtain adequate relief, and recurrent use is associated with gastrointestinal (gastritis, ulcer), renal, and cardiovascular adverse effects.
Combined hormonal contraceptives suppress ovulation and reduce endometrial thickness, decreasing prostaglandin production. However, not all patients tolerate or wish to use hormones — whether due to clinical contraindications (smoking, history of thrombosis, migraine with aura), side effects (weight gain, mood changes), or personal preference. In these situations, medical acupuncture represents a non-pharmacologic, safe, and effective alternative.
Myth vs. Fact
NSAIDs resolve menstrual cramps in all women
About 20%–25% of patients do not obtain adequate relief from NSAIDs, and chronic use can cause gastrointestinal, renal, and cardiovascular adverse effects.
The birth control pill is the only alternative for those who do not respond to analgesics
Medical acupuncture is a non-hormonal option supported by clinical studies, indicated for patients who do not tolerate or do not wish to use contraceptives.
Menstrual cramps are normal and do not need treatment
Disabling pain that prevents daily activities is not "normal" — it is a treatable symptom. In addition, intense pain may be a sign of secondary dysmenorrhea (endometriosis, adenomyosis).
Acupuncture for cramps is just placebo effect
Systematic reviews and clinical trials describe an effect superior to control on menstrual-pain outcomes in some studies, with plausible neurophysiologic mechanisms — methodologic heterogeneity still limits the strength of the recommendation.
How Medical Acupuncture Works in Dysmenorrhea
Medical acupuncture acts on dysmenorrhea through multiple neurophysiologic mechanisms that affect both the cause of the pain and central processing of the nociceptive signal. The central axis of treatment is the reduction of sympathetic activity on the uterus, which promotes uterine artery vasodilation and decreases the buildup of lactic acid and prostaglandins in the myometrium.
Stimulation of points such as SP-6 (Sanyinjiao) and CV-4 (Guanyuan) activates afferent fibers that modulate sympathetic tone in the spinal segments T10-L1 and S2-S4, reducing uterine ischemia. In parallel, levels of PGF2-alpha and PGE2 in the endometrium decrease and the descending pain inhibitory pathways in the brainstem are activated, with release of beta-endorphins and enkephalins that provide sustained central analgesia.
Mechanism of Action of Acupuncture in Dysmenorrhea
Stimulation of acupuncture points on the abdomen and lower limbs
Needling of points such as SP-6, CV-4, ST-36, and LR-3 activates A-delta afferent fibers connected to spinal segments T10-L1 and S2-S4, which innervate the uterus.
Reduction of uterine sympathetic hyperactivity
Modulation of sympathetic tone in the spinal ganglia promotes uterine artery vasodilation, reversing the myometrial ischemia that is the direct cause of pain.
Reduction of prostaglandins in the endometrium
Decreased levels of PGF2-alpha and PGE2, reducing the intensity of uterine contractions and lactic acid buildup in the myometrium.
Activation of descending inhibitory pathways
Release of beta-endorphins and enkephalins in the brainstem (periaqueductal gray matter), providing central analgesia that exceeds the local effect.
Regulation of the hypothalamic-pituitary-ovarian axis
Normalization of central neurotransmitters (serotonin, noradrenaline) that modulate pain perception and neurovegetative balance during the menstrual cycle.
What the Scientific Studies Say
Dysmenorrhea is among the gynecologic conditions with the largest volume of scientific evidence on acupuncture. Systematic reviews published in indexed journals describe reduction of menstrual pain intensity and analgesic need in some studies — with a favorable safety profile. Direct comparison with NSAIDs, however, requires caution due to methodologic heterogeneity, and acupuncture should be understood as a complementary option and not a substitute.
What Is Different About the Modern Approach
Contemporary medical acupuncture goes far beyond traditional needling. The medical acupuncturist uses technologic resources that potentiate therapeutic effects, such as electroacupuncture and low-level laser therapy (LLLT).
Electroacupuncture allows precise control of nerve stimulation frequency. In dysmenorrhea, low frequency (2 Hz) preferentially activates the endorphinergic system — potentiating the release of beta-endorphins that promote central analgesia. Low-level laser therapy is a valuable noninvasive option for patients with needle phobia or adolescents, and can be applied at the same acupuncture points with local analgesic and anti-inflammatory effect.
When to See a Physician
If you have menstrual cramps that limit your daily activities, cause school or work absenteeism, or do not improve adequately with common analgesics, see a specialist physician. It is essential to rule out secondary causes of dysmenorrhea, such as endometriosis and adenomyosis, which require specific diagnostic and therapeutic approaches.
Frequently Asked Questions
The standard protocol involves 6 to 10 sessions, ideally started in the luteal phase (one week before menstruation). Most patients perceive significant improvement starting from the second or third menstrual cycle with treatment. After the initial protocol, monthly maintenance sessions can prolong the benefit for several months.
In some cases, patients can reduce the dose and frequency of analgesic use with acupuncture as an adjuvant. However, the ideal approach is integrative: any medication adjustment should be discussed with the attending physician, gradually and individually, never abruptly.
Needle insertion causes minimal sensation — very different from an injection. In dysmenorrhea, the most-used points are in the lower abdominal region and on the lower limbs (legs and feet). The session lasts 20 to 30 minutes, and most patients report a sensation of relaxation and relief during the procedure.
Yes. Acupuncture is safe for adolescents and is an excellent non-pharmacologic option. For younger patients or those wary of needles, the medical acupuncturist may start with low-level laser therapy or auriculotherapy (stimulation of points on the ear with seeds or microspheres), with gradual transition to conventional needling.
Acupuncture acts at both levels. In addition to providing central analgesia via endorphin release, it reduces prostaglandin production in the endometrium and decreases uterine sympathetic hyperactivity — that is, it acts directly on the pathophysiologic mechanisms that generate menstrual pain, not just on the symptom.
Yes, and it is in fact recommended. Sessions performed during the menstrual phase (rescue sessions) can provide rapid relief of acute pain. The most effective protocol combines preventive sessions in the week before menstruation with rescue sessions in the first days of the cycle, when pain is most intense.