Endometrial lesions belong to a group of common gynecological diseases, which can be divided into benign and malignant lesions. Benign lesions often refer to endometritis, endometrial polyps, endometrial hyperplasia, etc., while malignant endometrial lesions mainly refer to endometrial cancer. The causes of each kind of lesion are different, and the common causes are as follows: 1. Benign lesions 1. Endometritis: Endometritis is mainly due to damage to the endometrium after delivery, abortion and gynecological surgery, and bacteria take advantage of the opportunity to enter the damaged endometrium and become infected, with common pathogens such as Chlamydia, Neisseria gonorrhoeae, Mycoplasma, etc.; 2. Endometrial hyperplasia: Most endometrial hyperplasia is due to long-term stimulation by estrogen and lack of progesterone. 3, endometrial polyps: the etiology and pathogenesis of endometrial polyps are not yet clear, and may be related to high estrogen levels and inflammatory stimulation. In addition, factors such as obesity, hypertension, and long-term application of tamoxifen after breast cancer surgery can increase the risk of this disease. Malignant lesions of the uterus are mainly endometrial cancer, the exact cause of which is unknown and may be related to excessive estrogen stimulation of the endometrium; in addition, obesity, hypertension, diabetes, early menarche and late menopause, infertility and ovarian disease are high-risk factors for the appearance of this disease.