One or two drops less menstrual flow belongs to a kind of menstrual abnormality, and the possible causes include physiological factors, endocrine disorders, gynecological diseases, and the effects of certain drugs. 1. Physiological factors: Poor living habits, such as staying up late for a long time, irregular diet, excessive weight loss, etc., may cause a decrease in menstrual flow. 2. Endocrine disorders: affected by psychological factors and certain diseases may cause endocrine disorders and disorders in the secretion of estrogen and progesterone, which may lead to decreased menstrual flow. 3. Gynecological diseases: such as uterine structural abnormalities, gynecological inflammation and other diseases may affect normal menstruation, resulting in low menstrual flow. 4. The effect of certain medications: such as birth control pills, may affect the hormone levels in the body, thus affecting the menstrual flow. There may also be other reasons for low menstrual flow, so we suggest that you go to the hospital for hormone six, ultrasound and other tests, so that you can identify the causes under the guidance of a professional doctor and get targeted treatment.