Red discharge from women’s underwear may be caused by inflammation of the urethra, vagina or normal physiological bleeding. If it is caused by inflammation of the urethra, often accompanied by frequent urination, urinary urgency symptoms, it is recommended to take quinolone drugs and drugs to clear the drenching and draining of the lower part of the body for treatment. If it is caused by vaginal inflammation, it is recommended to do routine leukorrhea test in order to diagnose the type of vaginitis and treat the symptoms, and avoid sexual intercourse and bathtub during the treatment. Common physiological bleeding is red discharge on the panties when menstruation first comes, ovulation bleeding during ovulation, and bleeding when the fertilized egg is deposited after seven days of coitus. If there is red discharge in a girl’s underwear, it is recommended to first determine whether it is physiological or pathological. If it is physiologic, pay attention to personal hygiene, pay attention to washing the vulva can be, do not need special treatment. If it is pathologic, you need to go to the hospital for examination and symptomatic treatment.