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What is dysmenorrhea? Pain associated with menstruation is called dysmenorrhea. How common is dysmenorrhea? Dysmenorrhea is the most commonly reported menstrual disorder. More than one half of women who menstruate have some pain for 1–2 days each month. What are the types of dysmenorrhea? There are two types of dysmenorrhea: primary dysmenorrhea and secondary dysmenorrhea. What is primary dysmenorrhea? Primary dysmenorrhea is pain that comes from having a menstrual period, or “menstrual cramps.” What causes primary dysmenorrhea? Primary dysmenorrhea usually is caused by natural chemicals called prostaglandins. Prostaglandins are made in the lining of the uterus. When does the pain...