Drowsiness after meals to be vigilant may be anemia, hypothyroidism, but may not be caused by disease. 1. Sleepy after meals is more common is anemia, mainly because of insufficient red blood cell production, or reduce the number of red blood cells in the peripheral blood of the human body is small, unable to meet the physiological needs of the body, thus appearing sleepy after meals phenomenon. 2. It may also be caused by hypothyroidism, such as surgery or medication and other factors, resulting in a reduction in the production of hormones by the thyroid gland, there will be sleepiness after meals. In addition, sleepiness after meals may also be a normal physiological phenomenon, if too much food, blood will be redistributed, the blood shunt to the stomach increases, the brain will have a transient ischemia and hypoxia caused by sleepiness after meals. Physiological drowsiness after meals does not require special treatment, but if it is caused by pathological reasons, you should go to the hospital in time, check and identify the cause of treatment.