Menorrhagia

Childhood menstruation includes several meanings, such as heavy menstrual blood and long bleeding (7 days) (menorrhagia), frequent menstruation (20 days) (polymenorrhea), frequent bleeding and irregular or combined menstrual blood (menometrorrhagia) The latter are mostly anovulatory functional uterine bleeding. More menstrual flow is a symptom, not an independent disease. The standards are not uniform, such as menstrual volume exceeding 80ml, 150ml or hemoglobin decreased by more than 2g after each menstruation.