More than twenty days after the abortion brown discharge is an abnormal phenomenon, may be the existence of the uterine cavity residue, the uterus is not fully recovered, resulting in the emergence of the uterine cavity infection. You need to go to the hospital in time to do the relevant examination to clarify the cause and carry out the treatment of the cause. Abortion surgery will cause damage to the uterus, so bleeding after surgery is normal, but usually not more than 7 days. If there is still brown discharge more than 20 days after the operation, it may be due to the presence of uterine cavity residue, the uterus has not fully recovered, resulting in infection of the uterine cavity. Patients need to go to the hospital for ultrasound, blood tests and other tests to clarify the cause. If the abortion is incomplete, the uterus should be cleaned and treated, and if there is an infection, it should be treated with anti-infection under the guidance of the doctor. In addition, there are some patients whose bleeding is caused by lesions in the endometrium or cervix, and they need to undergo further examination before treatment. Therefore, brown discharge more than twenty days after abortion, it is recommended to go to the hospital in time to avoid worsening of symptoms.