Feeling hungry immediately after a meal may be a normal physiological phenomenon, such as gastrointestinal peristalsis, etc., but it may also be an abnormal pathological phenomenon, such as hyperthyroidism, diabetes mellitus and so on. 1. Physiological phenomena: (1) Excessive gastrointestinal peristalsis: some people may feel hungry immediately after meals due to excessive gastrointestinal peristalsis, which leads to rapid gastrointestinal emptying. (2) Too little intake: If you fail to eat enough during meals for various reasons, it can also lead to hunger immediately after meals. In addition, teenagers can also feel hungry immediately after meals due to rapid metabolism. 2. Pathologic factors: (1) hyperthyroidism: patients can be due to the thyroid hormone secretion of the body’s metabolic rate increases, nutrient consumption increases, appear immediately after meals feel hungry, in addition, can also be accompanied by fear of heat, panic, weight loss and other phenomena. (2) Diabetes mellitus: patients may feel hungry immediately after meals due to low utilization of blood glucose and increased body consumption. In addition, if patients inject too much insulin, which triggers hypoglycemia, they may feel hungry immediately after meals and may be accompanied by excessive drinking, urination, and weight loss. In addition, there are many other causes of hunger immediately after a meal, it is recommended to consult a doctor in time and receive treatment as soon as possible after eliminating physiological factors.