Damage to the lining of the uterus can cause adhesions, and the common causes are related to repeated uterine operations, endometritis, and poor blood supply to the uterus, etc. 1. Frequent uterine operations such as abortion, IUD insertion, IUD removal, and curettage may damage the basal layer of the uterus, resulting in a thinning of the lining of the uterus, poor blood supply, and adhesions. 2. Infections of the lining of the uterus, such as genital tuberculosis, can lead to menstrual weakness and adhesions. 3. After cesarean section or fibroid removal surgery, the local blood supply is not good, and the blood vessels at the suture place are ligated, and adhesion occurs gradually. The main symptom of endometrial adhesion is the change of menstrual flow, which can be diagnosed by ultrasound or hysteroscopy when abnormalities are detected. If there is inflammation, timely treatment can be taken, and if there is no inflammation, an intrauterine device can be placed to prevent further aggravation of the adhesions.