Endometritis is an inflammatory change in the endometrium, caused mainly by bacterial invasion of the endometrium. The causes of endometritis are as follows: 1. Intrauterine devices with birth control, which can cause endometritis due to long-term stimulation of the endometrium by the device. 2. Lesions in the uterine cavity, such as submucosal fibroids or endometrial polyps, can cause endometritis. 3. Women’s endometrium becomes thinner due to aging and lower estrogen, which can easily lead to bacterial invasion and can cause endometritis. 4, Other gynecological inflammatory diseases, such as vaginitis, cervicitis, tubitis, etc., can cause endometritis through upstream transmission. 5, do not pay attention to lower body hygiene, not diligent bathing, diligent change of underwear, menstrual intercourse, etc., these actions can cause endometritis. 6. After childbirth or abortion, there is a small amount of residue in the uterine cavity which can easily cause infection and can cause endometritis. 7. After uterine surgery, which can easily lead to the invasion of bacteria, can cause endometritis. As mentioned above are the main causes of endometritis, usually pay attention to hygiene and do preventive work so that you can avoid getting endometritis.