Eating very little and feeling full is considered to be caused by chronic gastritis, ascites, intestinal dysfunction, gastric cancer and other reasons. 1. Chronic gastritis: chronic gastritis is a chronic inflammatory reaction of gastric mucosa, most patients have indigestion symptoms of varying degrees, such as epigastric pain, loss of appetite, feeling full and nausea after eating little. 2. Ascites: If there is a large amount of ascites in the abdomen, it will also produce a feeling of fullness and bloating while eating little. This condition is usually accompanied by nausea, swelling, abdominal distension and other symptoms. 3. Intestinal dysfunction: if the patient has intestinal dysfunction, it may lead to the decrease of intestinal digestive ability and slow gastrointestinal peristalsis, which may lead to the phenomenon of having bloated tummy despite not eating much. 4. Stomach cancer: Most stomach cancer patients do not have obvious symptoms in the early stage, but a few of them may have minor discomfort symptoms such as bloatedness, indigestion, poor appetite, burning sensation in stomach and so on, even though they do not eat much. Patients who feel full and bloated even though they do not eat much need to go to the hospital for examination in time. According to the results of the examination, to clarify the cause of the disease, treatment and medication under the doctor’s instructions.