Bleeding again two days after the end of menstruation may be a physiological phenomenon, vaginal bleeding or endocrine dysfunction; it may also be a pathological cause, such as vaginitis, cervicitis, polyps, tumors; or other factors. 1. Physiological factors: (1) Have sex to consider vaginal bleeding caused by sexual intercourse: the endometrium has not been fully repaired for two days after menstruation, and when intercourse is carried out at this time, the endometrium will be congested by stimulation, which will lead to vaginal bleeding. (2) female endocrine dysfunction: during menstruation, the menstrual blood is not discharged well, part of the menstrual blood is stagnant in the uterine cavity, and when the menstrual period is over, due to exercise and other factors to promote the discharge of menstrual blood, which will lead to bleeding after the menstrual period has stopped. 2. Pathological factors: such as vaginitis, cervicitis, can lead to a small amount of vaginal bleeding, in addition, polyps and tumors can also lead to menstruation stopped for two days and then came back. 3. Other factors: such as taking certain drugs, intrauterine device or blood diseases can also lead to irregular vaginal bleeding. Therefore, there are many reasons for bleeding after two days of menstruation. If you exclude physiological reasons, you should go to the hospital in time, ask the doctor to clarify the cause of the disease, and improve the relevant examinations for symptomatic treatment.