The most common causes are abnormalities of the endometrium and disorders of the endocrine system of the body, as well as irregular vaginal bleeding due to tumors of the reproductive system. The brown discharge is mainly old blood, mostly probably residual in the uterus as well as in the vagina, most commonly during menstruation, and its constant presence needs to be considered abnormal. Ultrasound and hormone level tests are recommended to understand the specific situation and endometrial biopsy is needed if necessary. Endometrial tumors are the more common cause of persistent irregular vaginal bleeding. Tumors of the cervix may also cause persistent bleeding, and most of the symptoms worsen after sexual intercourse.