The menstrual period is not allowed to open up the valley, open up the valley will cause low blood sugar and other symptoms, is not good for the body. During menstruation, the body will lose part of the blood, at this time the resistance is low, need to increase nutritional supplementation to recover, it is not allowed to start grain, will lead to insufficient food intake, nutrition can not be properly supplemented, will cause hypoglycemia and other symptoms, the health of the body is not beneficial. During menstruation, it is easy to be tired, weak, and even symptoms such as lower abdominal discomfort, you should pay attention to rest, avoid staying up late, ensure sufficient sleep, eat more fresh fruits and vegetables, balanced nutrition, and at the same time pay attention to warmth, keep a relaxed mood, appropriate physical exercise, enhance immunity.