The pain is often caused by the following reasons: 1, the abortion is incomplete, when there is still residual tissue in the uterus, it will stimulate the contraction of the uterus, there is pain in the small abdomen, often accompanied by relatively fresh vaginal bleeding, it is recommended to go to the hospital as soon as possible to check, if there is residue in time to do clearance surgery. 2, caused by infection, only in the case of pathogenic bacterial infection, because of inflammation will cause pain in the small abdomen. You can take oral antibiotics for treatment, and if necessary, go to the hospital for further examination, and also intravenous drip antibiotics to control inflammation.