The causes of dysmenorrhea, nausea and vomiting during menstruation are generally due to elevated prostaglandins in the blood, pelvic congestion during menstruation, gastrointestinal disorders, and liver and gallbladder disorders. 1. Elevated prostaglandins in the blood: As prostaglandins are elevated in the blood during menstruation, prostaglandins can easily lead to uterine excitation and cause strong contraction of uterine muscles, which can lead to dysmenorrhea. Prostaglandins act on the gastrointestinal tract, which can lead to nausea and vomiting. 2. Pelvic congestion: Pelvic congestion during menstruation, severe dysmenorrhea, can easily cause digestive reactions and cause nausea and vomiting symptoms. 3. Gastrointestinal disorders: Nausea and vomiting can be caused by improper diet or eating cold, chilled or unclean food. 4. Liver and gallbladder disorders: Liver and gallbladder disorders mainly lead to digestive symptoms, causing anorexia, nausea and vomiting, diarrhea and other symptoms. Menstrual cramps nausea and vomiting may also have other causes, need to go to the hospital in a timely manner under the guidance of the doctor after a clear diagnosis of standardized treatment, should avoid self-medication to avoid causing adverse consequences.