Frequent hunger after two to three hours after a meal Consider normal and pathologic conditions such as gastric ulcers, hyperthyroidism, diabetes, etc. 1. Normal conditions, such as eating less or exercise, growing adolescents with high activity and fast metabolism, often have a feeling of hunger when eating the next meal. 2. Gastric ulcer, gastric acid secretion increases after eating, some patients describe it as hunger upset stomach, gastroscopy is the preferred method and gold standard for the diagnosis of gastric ulcer. 3. Hyperthyroidism, due to excessive circulating thyroid hormone can cause agitation, hyper appetite, excessive sweating, fear of heat and other symptoms of high metabolism, serum TSH is the most sensitive indicator reflecting the function of the thyroid gland. 4. Diabetes mellitus is a metabolic disease characterized by elevated blood glucose, with the main symptoms of overeating and hunger, polyuria, polydipsia, and weight loss. Those who feel hungry frequently after two or three hours after meals are advised to go to the hospital for further examination to clarify the cause of the disease and to be treated under the guidance of a doctor.