Adenomyosis is a condition in which the endometrial glands and mesenchyme invade the myometrium, resulting in periodic growth, atrophy and necrosis, often in combination with fibroids and endometriosis, mostly in menstruating women between the ages of 30 and 50. The causes of adenomyosis are many, but the exact cause is not clear. It is considered that adenomyosis may be caused by the direct connection between the endometrial lesions of the myometrium and the endometrium of the uterus, often due to multiple pregnancies and deliveries, or abortions, or even chronic endometritis, resulting in damage to the endometrial basal layer, which causes the endometrial glands to grow and shrink in the myometrium. Since the endometrial basal layer lacks submucosa, the endometrium is in direct contact with the myometrium, thus causing the endometrium to invade the myometrium, so patients with adenomyosis often have a combination of fibroids and endometrial hyperplasia, while the high level of estrogen and progesterone preparations in the body may also cause adenomyosis to occur. Adenomyosis is often seen in women who have not given birth or had an abortion, and is generally rare. Since adenomyosis can lead to infertility, it is important to prepare for pregnancy as soon as possible after the diagnosis is confirmed and if there is a desire to have children.