There are several reasons for vomiting and diarrhea during dysmenorrhea: 1. It may be the result of a strong secretion of prostaglandins in the body during dysmenorrhea and the reaction of dysmenorrhea caused by excessive contraction of the uterus. This is a serious case of dysmenorrhea, when the dysmenorrhea is more serious, it will stimulate other organs, such as the anus and intestines, so it will produce the symptoms of vomiting and diarrhea. 2, if you often eat cold, stimulating food, do not pay attention to health care will lead to a weaker body, resulting in the problem of uterine cold. When the menstrual period comes, patients with uterine cold menstrual blood is not discharged smoothly, stimulating the body will appear vomiting and diarrhea and other symptoms. Other physical reactions may occur, such as dizziness, headaches, etc. 3, may be due to psychological reasons or dietary reasons, the onset of menstruation during the psychological stress, improper diet may appear vomiting and diarrhea.