There are many causes of menstrual disorders and dysmenorrhea, so we must first consider changes caused by organic lesions, such as adenomyosis, which can cause increased menstrual flow, prolonged menstruation, and progressively worsening dysmenorrhea. There may even be pain during sexual intercourse, and abdominal pain may also occur occasionally. Apart from organic lesions, even after excluding organic conditions, some women may still experience menstrual disorders and dysmenorrhea. For example, adolescent girls often experience primary dysmenorrhea along with menstrual irregularities, which could lead to functional bleeding.