Women should not have intercourse during menstruation, nor should they engage in strenuous exercise, such as running or swimming. They should also not eat spicy and cold food, and try to eat light and easily digestible food. It is forbidden to have intercourse during menstruation because it may cause pathogenic bacteria to infect the pelvic cavity and cause pelvic inflammatory disease, and it may also cause ectopic endometrium to the ovaries or invade the myometrium, which may lead to ovarian chocolate cysts or adenomyosis. If a woman exercises vigorously during her menstrual period, it may speed up blood circulation and lead to increased menstrual flow, and it may also affect the contraction of the uterus and cause prolonged menstrual periods. For women who have menstrual cramps themselves, if they eat spicy and stimulating and cold food during their menstrual period, it may affect the discharge of menstrual blood leading to increased menstrual cramps.