Common malignant tumors of the uterus include endometrial cancer and uterine sarcoma. Among them, early endometrial cancer and uterine sarcoma are mainly treated by surgery. After surgery, radiotherapy or chemotherapy may be given accordingly depending on the stage. The causes of uterine malignant tumors are not clear yet, but it is considered to be related to the following common factors: 1) unclean sex: if a woman has more than 2 male partners, the chance of developing uterine cancer will increase significantly. 2) age: the majority of patients with endometrial cancer develop in the perimenopausal period. 3) smoking: smoking reduces the immune system of the body and accelerates the development of uterine cancer cells; smoking itself produces some substances which may lead to the development of uterine cancer cells. 4) smoking: smoking is not a good choice for the development of uterine cancer. may lead to the development of uterine cancer cells.