The constant desire to eat indicates the possibility of hyperphagia, and there are several conditions. First, it is seen in stomach diseases, caused by excessive secretion of stomach acid or the presence of gastritis or gastric ulcer. Gastroscopy is required to make a clear diagnosis. Secondly, it is seen in diabetic patients, which often manifests clinically as excessive drinking, polyphagia, polyuria and wasting. It is recommended to perform fasting glucose and two-hour postprandial glucose to make a clear diagnosis. Third, see in thyroid disease, hyperthyroidism patients also manifest as hyperphagia, mental hyperactivity, etc.. It is recommended that thyroid function tests be performed to clarify the diagnosis. Fourthly, it is seen in pregnant women, as the developmental needs of the fetus will lead to an increase in appetite and food intake to meet the nutritional supply, which is a normal phenomenon and does not require special treatment. The first three cases, once diagnosed, need to be treated by a specialist.