Lower body usually refers to the private parts. The reason why women bleed in their private parts when they are straining to have a bowel movement is related to menstrual factors, vaginal inflammation, cervical cancer and other factors. 1. Menstruation factor: If a woman is in her menstruation period and exerts herself too much when she is having a bowel movement, the menstrual blood in the uterus will be discharged, which is a normal phenomenon. Women in their menstruation period will have the phenomenon of accumulation of blood in the uterus due to the shedding of uterus’ endometrium, and there will be symptoms of bleeding from the private parts when the abdominal pressure increases by exerting oneself to have a bowel movement. 2. Vaginal inflammation: when women have vaginal inflammation disease, the vaginal mucous membrane may become brittle under the invasion of inflammation, and the capillaries may easily rupture and bleed, and there will be bleeding in the private parts under the effect of increased negative pressure. 3. Cervical cancer: when women have persistent high-risk HPV infection of cervical cancer, the early symptoms are not particularly obvious, with the development of the disease, it may develop from contact bleeding to vaginal bleeding, especially in the female bowel movement, such as abdominal pressure increases, private bleeding and vaginal discharge symptoms. The symptoms of bleeding in the lower body can not be accurately determined by the woman’s bowel movements alone, and it is necessary to cooperate with the doctor to do further examination to clarify the specific causes.