When menstrual cramps occur during menstruation, and the pain is so severe that diarrhea, nausea, vomiting, and cold sweats occur, it is mainly due to the fact that during menstruation the shedding of the uterine lining will secrete too much prostaglandins, and prostaglandins will cause the contraction of the uterine smooth muscle, which will cause severe pain in the lower abdomen. Prostaglandins not only contract the uterine smooth muscle, but also the smooth muscle of the gastrointestinal tract, so nausea, vomiting and diarrhea can occur. As the contraction of the uterine smooth muscle and the contraction of the smooth muscle in the body can also cause symptoms of cold sweats, which is why menstrual cramps are so painful that they cause diarrhea, nausea, vomiting and even cold sweats.