Masturbation is usually not allowed during menstruation. Masturbation may lead to dysmenorrhea, vaginitis, and endometriosis, among other negative consequences. 1. Masturbation during menstruation may cause dysmenorrhea. Masturbation may cause orgasm, which leads to uterine contractions, thus causing dysmenorrhea. Patients can use medication to treat dysmenorrhea under the guidance of a doctor. 2. Easy to cause vaginitis, the patient’s body resistance is weak during menstruation, masturbation may lead to bacterial infection, inducing vaginitis. There may be an increase in the amount of leukorrhea, itching and other uncomfortable symptoms, you can take antibiotic drugs under the guidance of the doctor to treat. 3. Masturbation may cause uterine contraction, leading to the reversal of menstrual blood in the uterine cavity, menstrual blood may enter the pelvis, causing endometriosis. If any of the above symptoms occur, it is recommended to seek prompt medical attention and treatment under the guidance of a doctor.