Low menstrual flow due to weight loss is related to unhealthy weight loss methods such as excessive dieting, the effects of medication or excessive weight loss. Women who have abnormal menstruation while losing weight should seek medical examination and follow medical advice for regulation. Common causes 1, excessive dieting: women who lose weight by dieting, due to too little diet, can lead to excessive lack of nutrients in the body, the ovaries lose nutrient supply, so that the central nervous system so that estrogen and progesterone can not be secreted normally, it will cause a low menstrual flow; 2, drug influence: women who lose weight by eating diet pills, if they are taking irregular weight loss drugs, or a long time to take large doses of drugs The endocrine dysfunction may lead to endocrine disruption, causing the consequences of low menstrual flow; 3, excessive weight loss: excessive weight loss leads to severe body wasting, lack of excess subcutaneous fat, the body’s required nutrients are not replenished, will also cause endocrine dysfunction, resulting in low menstrual flow, delayed menstruation, and even amenorrhea. Note 1, do not rely on drugs to lose weight, taking diet pills not only affects the endocrine function, but also damages the digestive system or other organ functions; 2, it is best for women to lose weight through a reasonable diet plus exercise to lose weight in a healthy way.