The hazards of abortion in the 4th month of pregnancy are as follows: First, it causes haemorrhage. In the fourth month of pregnancy, the fetus is basically formed, the fetus is relatively large, at this time to perform induction of labor is likely to lead to maternal haemorrhage. Secondly, it causes infection of the uterine cavity. Due to the operator’s irregular operation and sloppy sterilization, it will lead to the infection of the uterine cavity of the mother. Third, damage to the cervix. During the operation, the instruments enter the uterine cavity through the cervix, causing damage to the cervix. Fourth, adhesions in the uterine cavity, which leads to low menstrual flow. Fifth, causing infertility. Patients can cause infertility or ectopic pregnancy with a much higher chance. Sixth, perforation of the uterus. It may cause perforation of the uterus due to irregularities in the operation of the operator. Seventh, it may lead to habitual miscarriage. Therefore, I hope that you will pay attention to protecting your body after pregnancy.