Adenomyosis severity grades, which are judged primarily on the basis of the patient’s pain, can be categorized as mild or severe. Adenomyosis, also known as uterine adenomyosis, usually refers to the invasion of endometrial glands and mesenchyme into the myometrium and maintains functional changes such as cyclic hyperplasia, exfoliation, and hemorrhage, which in turn cause related symptoms. The etiology has not been clearly defined so far and may be estrogen-related. In patients with adenomyosis, it is often necessary to determine the severity of adenomyosis based on the patient’s clinical symptoms. In some patients, the symptoms are mild and the dysmenorrhea is not particularly severe, in which case it can be classified as mild. On the other hand, some patients with more severe dysmenorrhea, accompanied by increased menstrual periods and prolonged menstrual periods are classified as having severe adenomyosis. If adenomyosis is diagnosed in the clinic, early and standardized treatment is recommended to reduce the adverse effects of the disease.