Secondary clearing is uncommon, about 10%-20% possible, commonly seen in gravida, after induction of labor and abortion; secondary clearing is mostly used to remove intrauterine tissues left behind from the last clearing to avoid complications such as infection induced by intrauterine residues. Common reasons 1. gravida: the uterus of gravida patients is large and the uterine wall is thin, if the uterus is cleared by force, uterine perforation is likely to occur, so it needs to be performed in two sessions, at the same time, because the trophoblast cells of gravida patients are active, there is easy to have regenerated tissue, so the second clearance is also to ensure clean clearance and avoid recurrence; 2. after induction of labor: after induction of labor, there are more residual tissues in the uterine cavity, and it is difficult to clear the uterus at one time. It is difficult to remove the clean, need to carry out secondary clearance; 3, abortion: after abortion, there will be incomplete abortion or incomplete clearance, also need secondary clearance to remove residual material. Note 1, proper rest: after the second cleansing of the uterus, the body will be weaker, pay attention to rest, do not carry out heavy physical labor within half a month, and pay attention to keep warm to prevent colds; 2, supplemental nutrition: the second cleansing of the uterus is a more damaging uterine cavity operation, after surgery eat more protein, vitamin-rich food, such as chicken, fish, shrimp, eggs, milk, soy products and fresh fruits and vegetables, one month after surgery Avoid eating cold drinks, spicy and stimulating things within one month after the operation; 3, personal hygiene: pay attention to personal hygiene after the cleaning operation, otherwise it is easy to cause infection. Avoid sexual intercourse within one month after abortion, change sanitary pads diligently during the bleeding period, no sitz bath within half a month, only shower; 4, pay attention to bleeding: some patients will have blood leaking from the lower body about a week after the operation, if the bleeding time exceeds 15 days, the amount of bleeding exceeds the amount of menstruation, especially the discharge has a foul smell, and accompanied by fever, abdominal pain and other symptoms, infection may have occurred, should promptly go to the hospital Check and treatment, so as not to aggravate the condition; 5, do a good job of contraception: 3-6 months after the cleansing operation, when the endometrium has not fully recovered, if pregnant again, it can cause abortion, and abortion will bring serious trauma to the woman’s physiology and psychology again, so this stage needs to avoid another pregnancy through condoms, ligation, IUD, etc.