Aunt generally refers to menstruation. Frequent menstruation is mainly considered to be caused by abnormal ovarian function and uterine diseases. 1. Abnormal ovarian function: Normal menstrual cycle is usually 21-35 days, with an average of 28 days, if the menstrual cycle is shorter than 20 days, then it is frequent menstruation. In the case of abnormal ovarian function, due to insufficient function of the corpus luteum, the endometrium is not supported by progesterone, and shedding occurs, which then leads to a shorter menstrual cycle, manifested as frequent menstruation. 2. Uterine diseases: such as uterine fibroids, uterine adenomyosis, etc., especially submucosal fibroids, may lead to shortening of menstrual cycle and frequent menstruation, which may be accompanied by other symptoms, such as increased menstrual flow, prolonged menstruation, dysmenorrhea, as well as irregular vaginal bleeding, etc., which should be promptly consulted in the hospital. In addition, frequent menstruation can also be caused by other reasons, it is recommended to go to the hospital in time, under the guidance of the physician to actively cooperate with the relevant examination and treatment, so as to avoid delaying the condition.