Adenomyosis generally refers to adenomyosis of the uterus. The cause of the disease is not particularly clear, and it is considered to be related to uterine operations, inflammation of the endometrium and other causes. 1. Uterine operation: Multiple pregnancies and deliveries, abortions and other uterine operations can cause the endometrium to invade the myometrium and cause adenomyosis. 2. Endometritis: chronic endometritis can cause damage to the basal layer of the endometrium. Due to the lack of mucous membrane in the basal layer of the endometrium, the endometrium is easy to invade the myometrium when the lower layer of endometrium is in direct contact with the myometrium. 3. Other causes: adenomyosis is often combined with uterine fibroids and endometrial hyperplasia, which are considered to be related to high levels of estrogen; there is also a certain genetic predisposition to this disease. Adenomyosis can affect women’s health, and it is recommended that patients actively seek treatment.