There are many causes of adenomyosis, and the main causes are as follows: First, it may be a disease reaction caused by the proliferation of endothelial cells in the basal layer, when the proliferation of endothelial cells will invade the interstitium of the basal layer, thus causing a disease reaction. Secondly, it may be the disease symptoms after multiple pregnancies, scraping the uterus or undergoing cesarean section, which may cause damage to the myometrium during labor, and may also lead to the invasion of bacteria or viruses into the body, thus triggering adenomyosis. Third, it may be caused by age factors or progesterone disorders, which may lead to the emergence of adenomyosis, usually pay attention to the observation of physical symptoms, if there is an abnormal reaction, it is best to go to the hospital in time for examination, and it is best not to carry out multiple abortions or scraping.