Nausea during menstruation is clinically caused by vaginal bleeding due to the shedding of the endometrium. When the endometrium is shed, it secretes prostaglandins, which some people are relatively sensitive to, and prostaglandins can cause contraction of the smooth muscle of the gastrointestinal tract, so it can cause nausea. It is clinically advisable to have nausea to increase the secretion of saliva in the mouth to reduce the occurrence of nausea, or to eat snacks that will interfere with the occurrence of nausea. If dietary adjustments do not improve the corresponding clinical symptoms, oral vitamin B6 can be taken to alleviate the situation. And it is also recommended to eat easily digestible food during menstruation to reduce the burden on the gastrointestinal tract.