Stomach and abdominal distension and hyperphagia may be caused by mental factors, diabetes, cortisolism, hyperthyroidism and other reasons. 1. Mental factors: stress or stimulation, often anxiety, depression can be manifested in hyper appetite, want to eat food, the stomach can not empty the food in time, resulting in fullness of the stomach and abdomen. 2. Diabetes: diabetic patients because of insulin abnormality, due to the usual diet control, may be manifested as hyperphagia, accompanied by thirst, polyuria and other symptoms, diabetes caused by peripheral nerve damage and lead to intestinal peristalsis caused by constipation, so the stomach and abdomen bloating. 3. Corticosteroidosis: the disease can be manifested as hyperphagia, due to eating too much, can not be emptied in a timely manner and lead to gastro-abdominal distension. 4. Hyperthyroidism: excessive secretion of thyroxine affects the gastrointestinal tract and causes bloating, hyperphagia, sweating, irritability and other symptoms. It is recommended to consult a doctor in time to identify the cause of the disease and treat it as soon as possible.