If a small amount of bleeding is normal after two or three days of menstruation, there may be a small amount of menstrual blood remaining in the uterine cavity after menstruation has just been cleared. Through strenuous exercise or sex, and eat cold, spicy stimulating food, stimulate uterine contraction caused by a small amount of bleeding, without treatment, pay attention to vulvar hygiene can be, and can not be in the bleeding period of coitus. Excluding normal conditions, endocrine disorders are considered, as well as gynecological inflammation, uterine fibroids, endometriosis, cervical cysts and uterine polyps and other causes of bleeding. If you take birth control pills frequently, it can also cause menstrual disorders and lead to bleeding. It is better to observe the bleeding amount, if the bleeding amount is relatively large, it is best to go to the hospital for ultrasound and sex hormone six and other related tests. According to the results of the examination to choose the appropriate treatment, it is recommended to change sanitary napkins to avoid causing gynecological infections.