Irregular menstruation refers to irregular menstrual cycle or irregular time of menstruation, which is clinically known as menstrual disorders. The first one is endocrine disorder, when the estrogen or progesterone in the body is out of balance, it will lead to menstrual disorders. Secondly, organic lesions of the uterus, such as submucosal fibroids or large interstitial fibroids, may shorten the menstrual cycle, prolong the menstrual period, and increase the menstrual volume. The initial diagnosis can be made clinically by ultrasound examination and, if necessary, surgery can be performed. Thirdly, clinically, endometrial cancer or atypical hyperplasia may cause irregular menstruation.