Menstruation is not able to take away the residue from the uterine cavity. If there is bruising in the uterine cavity, it can be eliminated by menstruation using medication to remove the bruising. Menstruation is due to the secretion of hormone levels in the body, resulting in the normal shedding of the endometrium on a regular basis. The normal shedding of the endometrium is an important criterion for maintaining the female physiological cycle in general. Normal menstruation is usually in 3-5 days. The main component of menstruation is the endometrium which does not contain fibrinogen. Uterine residue belongs to the foreign body in the uterine cavity, and the foreign body in the uterine cavity may attach to the uterine wall will occur cervicitis, endometritis and other serious gynecological diseases, which are treated by uterine removal. For unexplained residual uterine cavity, hysteroscopy is also required for examination and treatment. Based on the woman’s age, medical history, symptoms, signs and auxiliary examinations, it is possible to determine the presence of residues in the uterine cavity and take timely treatment measures.