Being very hungry but full as soon as you eat is related to weak spleen and stomach, pyloric obstruction, and indigestion. People with a weak spleen and stomach cannot moisten and absorb food in time after eating, which will lead to increased hunger in the long run. However, because of the weak spleen and stomach, a feeling of fullness will appear in the stomach when eating a small amount of food. People with a weak spleen and stomach can consider applying Chinese herbal medicine for regulation. Some people will develop scarring due to long-term ulceration in the pyloric area, which induces pyloric obstruction. These people will feel fuller after eating food because of the obstruction and the food in the stomach cannot be emptied in time. However, the intestinal system is unable to absorb the nutrients in the food, and there will be a feeling of hunger. When there is indigestion in the body, the emptying and digestion of food in the stomach will be affected and the absorption of nutrients from food in the intestinal tract will be hindered, and these symptoms will also occur at that time.