Vomiting during menstruation is mainly due to bleeding caused by shedding of the uterine lining during menstruation. When the endometrium sheds, the prostaglandins secreted are different due to individual differences. When the amount of prostaglandins secreted is low, it does not cause pain in the lower abdomen or other symptoms. When more prostaglandins are secreted, it may lead to contraction of the smooth muscle of the uterus and also the smooth muscle of the gastrointestinal tract, and the symptoms of nausea and vomiting may occur. Vitamin B6 can be taken orally to relieve vomiting. It is recommended to try to eat easy-to-digest food to reduce the burden on the gastrointestinal tract during menstruation.