Brown blood after masturbation may be due to the onset of menstruation, intermenstrual bleeding and hymen rupture and other factors, the patient should consult a doctor in a timely manner to clarify the cause of the disease after treatment. 1. Menstruation: If you masturbate near the menstrual period and have brown blood after masturbation, you should consider that it is menstruation, and this kind of people will also have symptoms such as chest distension, lumbar pain, and fatigue, etc. Bleeding can be stopped by itself in about 5 days, and there is no need for special treatment. 2. Bleeding between periods: If the vaginal brown blood after masturbation is in the middle of two menstrual periods, it may be caused by changes in estrogen levels, part of the endometrium shedding vaginal bleeding, if it is occasional without special treatment, if it is continuous for several months, you should consult a doctor in a timely manner, to be examined. 3. Hymen rupture: If you have not had sex before and there is a foreign object entering your lower body during masturbation, you can consider that it is due to hymen rupture caused by vaginal brown bleeding, and it does not need special treatment.