Not feeling hungry may be caused by many reasons such as eating too much, gastritis, digestive tract tumor and so on. 1. Eating a lot: when patients eat a lot in daily life, the stomach can not digest the food normally, then there is always food in the stomach, and then patients will not feel hungry. 2. Gastritis: After the stomach is infected by Helicobacter pylori, it can cause gastritis, peptic ulcer and other diseases. After suffering from this disease, poor digestion ability of the stomach will affect gastric emptying, and then there will be symptoms such as not feeling hungry and loss of appetite. 3. Tumor of digestive tract: When the elderly patients have the symptoms of lack of appetite accompanied by wasting and other alarm symptoms, they need to be alert to the possibility of tumor of digestive tract. Tumor of digestive tract will cause pressure on the surrounding tissues, so that the patients can have the pain in the abdomen, the feeling of defecation, aversion to oily diet and other manifestations. In the long run, there will be wasting, anemia and other chronic diseases. Not feeling hungry may also be caused by other reasons, patients should go to the hospital in time to clarify the specific situation.