The reasons for low menstrual volume after abortion are as follows: 1, abortion surgery is easy to cause tension and anxiety to patients, resulting in low menstrual volume for a short period of time, after abortion, the patient’s ideological baggage off, menstrual volume will slowly adjust to normal; 2, a small number of patients because of scraping or some tissue residue after surgery resulting in low menstrual volume or amenorrhea, the need for secondary surgery to remove the bad tissue, menstruation back to normal 3. The surgical operation of abortion causes adhesions of the cervix or the uterine cavity. Cervical adhesions are characterized by low menstrual flow and periodic abdominal pain. Uterine adhesions are caused by damage to the endometrium during the operation, the amount of endometrium becomes less, and the menstrual volume decreases accordingly; 4. Multiple abortion operations cause extensive lesions of the endometrium, and some patients may even become amenorrheic; 5. Patients may suffer from stress endocrine abnormalities, premature ovarian failure, and problems with ovarian function due to the stimulation of abortion operations, which can affect the menstrual volume and require treatment in the hospital for the situation.