There are the following reasons for feeling hungry all the time: 1. Diseases in the digestive organs such as the gastrointestinal tract and other organs, the function decreases, and the food intake cannot be digested and absorbed well, which will affect the blood sugar concentration in the blood, and the blood sugar concentration will decrease, so you will feel hungry all the time. 2. Poor liver function, when the blood sugar concentration in the body decreases, the liver cannot break down a lot of glycogen to keep the normal circulation of the body, so the blood 3, hyperthyroidism will lead to an increase in thyroid hormones in the body, which may lead to hunger, in addition to eating a lot of food will not get fat. 4, poor kidney function will lead to the gastrointestinal absorption of nutrients can not smoothly participate in the blood circulation, so the body will always be in a state of nutrient deficiency, so it will always feel hungry, even if Just eat food will also feel hungry.