The menstrual discharge of large pieces of endometrium may be normal, or it may be caused by the residual after abortion. 1. Normal situation: Women’s menstruation is due to changes in hormone levels in the body, resulting in the formation of cyclic shedding of the endometrium, so the menstrual blood contains endometrium, blood and cervical secretions. 2. Post-abortion residuals: If there is a small amount of residuals in the uterine cavity after abortion, it is possible that they will be dislodged along with the endometrium during the next menstrual period. When discomfort occurs during menstruation, or there is heavy vaginal bleeding, abdominal pain and other abnormalities, it is recommended to go to the hospital as soon as possible for examination, to clarify the cause of the disease, and then follow the doctor’s instructions to deal with the treatment.