Menstruation not draining downward may be caused by cervical adhesion, abnormal position of the uterus, cervical lesions and other factors. 1. Cervical adhesion: If a woman has had an abortion before, resulting in adhesions in the uterine cavity, the menstrual blood cannot be discharged, and she may feel that her menstruation does not go downward. 2. Abnormal position of the uterus: Abnormal position of the uterus, such as anterior flexion and anterior tilt of the uterus, may lead to obstruction of menstrual blood discharge, so that the menstrual blood does not flow smoothly or does not discharge downward. 3. Cervical lesions: for example, cervical polyps, cervical tumors, etc., may lead to local narrowing of the cervix, which will affect the discharge of menstrual blood, resulting in menstrual blood can not be discharged or discharged not smooth. If the menstrual flow is not discharged downward and there are other abnormal manifestations, it is recommended to consult a doctor for appropriate examination and treatment to avoid causing other complications.