The feeling of fullness without eating much is considered to be related to gastric insufficiency, intestinal flora disorders, chronic gastritis, hypothyroidism and other factors. 1. Gastric dyskinesia: some patients may suffer from insufficient contraction and peristaltic force of stomach muscles, so even if the intake of food is small, it will cause satiety symptoms, accompanied by loss of appetite, nausea and vomiting and other related symptoms. 2. Intestinal flora disorders: patients may have intestinal flora disorders due to improper diet, abuse of antibiotics, intestinal immune deficiency, etc. After the intake of food, the harmful bacteria in the intestines will overpopulate, and more gases will be produced after the fermentation of the food, which will lead to the symptom of satiety when not eating much. 3. Chronic gastritis: the reason for feeling full without eating much is not to exclude the possibility of chronic gastritis, especially in the case of Helicobacter pylori infection, long-term strong tea and alcohol, etc., the patient may have varying degrees of dyspeptic symptoms, such as fullness without eating much, loss of appetite, epigastric pain and so on. 4. Hypothyroidism: also known as hypothyroidism, mainly due to the shortage of thyroid hormones, especially in women, mainly to reduce the metabolic rate and sympathetic nervous excitement, will cause patients to have a feeling of fullness without eating much, and serious pericardial effusion, heart failure. It is recommended that patients can go to the gastroenterology department of the hospital, and need to cooperate with the doctor for examination to determine the cause before treatment and therapy.