The desire to drink water before menstruation is considered to be due to the fact that both estrogen and progesterone reach higher levels in the body before menstruation, which accelerates metabolism in the body. Progesterone affects the metabolism of water and produces water-sodium retention, which causes changes in water inside and outside the cells. It is a normal physiological reaction to produce the symptoms of thirst before menstruation. It is recommended to promote drinking more water in order to reserve water in the body to avoid losing more water due to the loss of menstrual blood during menstruation, which affects the blood circulation and normal metabolism in the body, and it is easy to have thirst during menstruation. Avoid the loss of menstrual blood and too little water intake to affect the normal blood circulation, affecting the normal metabolism of the body and the discharge of waste in the body, thus damaging health.