There are more reasons why menstruation does not come down a little bit, which may be caused by endocrine disorders, malnutrition, uterine cavity adhesion and other reasons. 1. Endocrine disorders: people who stay up late and suffer from insomnia for a long period of time may cause endocrine disorders in the body, resulting in low menstrual flow. 2. Malnutrition: Malnutrition caused by excessive dieting and weight loss may lead to a lack of body fat, affecting the synthesis of estrogen and progesterone. Low estrogen levels in the body may cause low menstrual flow. 3. Uterine adhesions: repeated abortion surgery, scraping, etc., easy to damage the endometrial basal layer of the uterus, the uterine cavity is infected, causing the uterine cavity adhesions, resulting in low menstrual flow phenomenon. There may be other reasons why menstruation does not come at all, so it is recommended that the patient go to the hospital in time to complete the relevant examinations, and under the guidance of a specialist to clarify the cause of the disease and target treatment.