The hazards of having an abortion on the 40th day of pregnancy are mainly reflected in the following three aspects: first, the hazards during the abortion. During abortion, there may be various risks such as infection of the uterine cavity, excessive damage to the endometrium, hemorrhage, uterine residue, uterine perforation and so on. Second, the effect on menstruation after abortion. If the patient’s uterine lining is damaged or adherent, the patient may have delayed menstruation or even amenorrhea after the operation. If the patient’s inflammation is more serious, there may be adhesion of the cervical canal, and the patient’s menstrual flow will be reduced or the menstrual period will not be able to come down, but accompanied by abdominal pain. Third, the impact on fertility. After abortion, it may cause secondary infertility or habitual abortion, and after pregnancy again, there may be adhesion of the placenta or implantation of the placenta.