Half a month after the abortion, the pain near the navel may be a normal phenomenon caused by uterine contraction, or it may be caused by incomplete abortion, pelvic inflammatory disease and other diseases, as well as other diseases such as ovarian cysts. 1. Uterine contraction: After the patient in the abortion, the uterus will appear the phenomenon of natural contraction, is a normal physiological phenomenon. In addition to abdominal pain, there will also be a small amount of bleeding, which is conducive to the recovery of the uterus. 2. Incomplete abortion: After the abortion, if the abortion is incomplete, there will be pregnancy residue in the uterus. The residue adheres to the uterus, which may irritate the uterus and cause it to contract violently, resulting in the symptom of pain near the navel half a month after the abortion. 3. Pelvic inflammatory disease:Pelvic inflammatory disease is caused by Neisseria gonorrhea, Chlamydia trachomatis and other pathogens infection, the patient will have increased vaginal discharge, lower abdominal pain, urinary difficulties and other symptoms. 4.Other:Ovarian cysts, enteritis and other diseases can also lead to pain near the navel half a month after the abortion. Patients in the abortion half a month after the symptoms of pain near the navel, and showed a trend of persistent aggravation, should be early medical care, a clear diagnosis of the causal factors, under the guidance of the doctor for symptomatic treatment and regulation.