The time of menstruation after abortion is related to the individual’s physical condition, recovery of the uterine lining, hormone levels, etc. Generally speaking, menstruation will be resumed in 4-6 weeks after abortion. Abortion is divided into two types: medication abortion and surgical abortion. Regardless of which type of abortion, it is an injury to the uterus, ovaries, and endocrine system, and it takes time to repair. After abortion, it takes about 2-3 weeks for the ovaries to resume ovulation function under various hormonal stimulation. And the uterine lining, which has been shed under medication or surgery, needs a process of re-thickening. It takes about 2 weeks after ovulation for the endometrium to thicken to a level where it can be shed and menstruation can occur, so the time for menstruation after abortion is about 4-6 weeks. Since abortion will cause a certain degree of damage to the uterine lining, which may lead to gynecological diseases such as uterine cavity, cervical adhesions, and endometritis, it is recommended to go to the Obstetrics and Gynecology Department of the hospital for ultrasound, hormone six and other related examinations if menstruation has not resumed more than 6 weeks after the abortion.