It is a benign lesion caused by the invasion of the uterine myometrium by the endometrium. It is because the endometrium grows directly from the basal layer. Pathologically, the myometrium was hypertrophic, There are Endometrium Glands like island and stroma between the muscular walls. It is accompany with Smooth muscle fiber hyperplasia. The pathogenesis of adenomyosis is more complicated. Clinically, it is considered that uterine trauma is frequently associated with abortion, childbirth and cesarean section. Specifically, the causes are inseparable from the following reasons. foreign body irritation factor. It mainly refers to uterine adenomyosis induced by instrument scraping and stimulation to the uterine gland mucosa at the time of production or gynecology examination. 2. Chronic gynecologic inflammation. Especially endometritis can make the boundaries of the uterine myometrium conducive to endometrial downward growth, which is also an important cause of adenomyosis. 3. Age factors. Although there is no sufficient evidence to show that adenomyosis is associated with age, most patients are at 40~60 years of age according to clinical statistics, so the incidence of age factors is not excluded. 4. The birth condition of the patient. Compared to women who have never been born, Adenomyosis is more common among women who have already been born. Therefore, it is believed that trauma of uterine wall during pregnancy and childbirth causes endometrial and stromal function to grow into myometrium, which is partly responsible for this disease. However, it is also reported that adenomyosis can also exist in young unfertile women and infertile women. The main symptoms of adenomyosis are menses of amount, menstruation, menstrual cycle, secondary dysmenorrhea, and the menstrual cycle of the patients. Adenomyosis is also the most direct cause of uterine adenomyosis. At the same time, there is a certain relationship between female infertility and adenomyosis.
