What Is the Main Cause of Dysmenorrhea?

What Is the Main Cause of Dysmenorrhea?

Dysmenorrhea, or painful menstruation, is one of the most common gynecological complaints affecting women of reproductive age. Its prevalence is remarkably high, with studies estimating that 45% to 95% of women experience menstrual pain, and 2% to 29% suffer from severe pain that interferes with daily activities . Understanding its main causes is essential for effective management.

Primary Dysmenorrhea and the Prostaglandin Mechanism

The most common type is primary dysmenorrhea, defined as menstrual pain without an identifiable underlying pelvic pathology . The primary cause of this condition is the excessive production of prostaglandins-hormone-like substances produced by the endometrium (uterine lining) .

During menstruation, as progesterone levels drop following corpus luteum regression, the endometrium releases large amounts of prostaglandins, particularly PGF2α. These substances trigger powerful uterine muscle contractions and constrict uterine blood vessels, reducing blood flow to the uterus and causing ischemia (oxygen deprivation). This combination of hypercontractility and ischemia produces the characteristic cramping pain . Women with primary dysmenorrhea have been found to produce up to seven times more prostaglandins than those without symptoms . Prostaglandins also sensitize pain nerve endings in the pelvic region, making them more responsive to pain stimuli.

Other contributing biochemical factors include vasopressin and oxytocin, both of which also increase uterine contractility and are found at higher levels in women with severe dysmenorrhea . The pain typically begins a few hours before or after the onset of menstrual bleeding, peaks with maximum blood flow, and lasts 2 to 3 days .

Secondary Dysmenorrhea: Underlying Pathology

Secondary dysmenorrhea refers to menstrual pain caused by an identifiable reproductive system disorder. The most common cause is endometriosis, where endometrial-like tissue grows outside the uterus, triggering inflammation and pain . Other causes include uterine fibroids, adenomyosis (endometrial tissue growing into the uterine muscle wall), pelvic inflammatory disease, and cervical stenosis . Secondary dysmenorrhea typically begins in adulthood and the pain often worsens over time .

 

Management Approaches

First-line treatment for primary dysmenorrhea includes nonsteroidal anti-inflammatory drugs (NSAIDs), which work by inhibiting cyclooxygenase enzymes and blocking prostaglandin synthesis, providing 30%–80% efficacy . Hormonal contraceptives are also highly effective by reducing menstrual flow and prostaglandin production . Non-pharmacological therapies with good evidence include local heat therapy and regular exercise .

 

 

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References

1. Pinkerton, J. V. (2025). Menstrual Cramps. MSD Manual Consumer Version.
2. Burnett, M. (2025). Guideline No. 345: Primary Dysmenorrhea. Journal of Obstetrics and Gynaecology Canada, 47(5), 102841.
3. Kirsch, E., Rahman, S., Kerolus, K., et al. (2024). Dysmenorrhea, a Narrative Review of Therapeutic Options. Journal of Pain Research, 17, 2657-2666.
4. Mayo Clinic. (2025). Menstrual Cramps - Symptoms and Causes.
5. National Institutes of Health. (2024). Period Pain. MedlinePlus.