Low menstruation may be related to abnormal ovarian function, damage to the uterine lining and endocrine disorders. 1. Abnormalities in ovarian function: If there are abnormalities in ovarian function, the secretion of estrogen may be reduced, which may lead to scanty menstruation. 2. Damage to the uterine lining: If a woman has recently undergone scraping or abortion, the uterine lining may be damaged, leading to menorrhagia. 3. Endocrine disorders: When a woman has endocrine disorders, such as polycystic ovary syndrome, pituitary tumors, prolactinomas and other diseases, she may also have low menstrual flow or even amenorrhea. There may be other reasons for menorrhagia, so it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment or therapy.