Always hungry after eating is an abnormal phenomenon, the specific reasons are as follows: 1, poor digestive function, when the small intestine and stomach can not function normally, it will not be able to convert food into nutrients, which will lead to lower blood glucose concentration, after which it is easy to cause hunger; 2, low blood glucose concentration, blood glucose concentration is too low will cause the feeling of hunger; 3, hyperthyroidism, thyroid hormone secretion is too much easily lead to overeating, wasting, patients 4, poor liver function, the liver of such patients in the lowering of blood glucose concentration can not be timely decomposition of glycogen to maintain the body’s energy needs, will consume the glycogen in the blood, will cause hunger symptoms, if easy to starve also obese, need to consider the cause of abnormal liver function; 5, poor kidney function, nutrients in the body need to go through the kidney filter, kidney problems Nutrients can not enter the blood will feel hungry.