Dysmenorrhea (also referred to menstrual cramps) is pain during menstruation. It happens less than three days after the menstruation starts. The pain is usually in the pelvis or lower abdomen.[1][2] Side effects can be diarrhea and nausea.
References
↑McKenna KA, Fogleman CD (August 2021). "Dysmenorrhea". Am Fam Physician. 104 (2): 164–170. PMID34383437.