There are two reasons for the large increase in appetite: first, functional factors. Second, organic factors. The so-called functional factors are mainly the result of recent mental overstimulation, or hyper-digestion due to rapid bowel movement. The so-called organic factors, also known as pathological factors, are mainly caused by endocrine disorders, such as hyperthyroidism, diabetes and subclinical thyroiditis, etc. Although these are endocrinology problems, not related to gastroenterology, such diseases can lead to increased peristalsis of the gastrointestinal tract and cause a large increase in appetite. Therefore, in this case, it is also necessary to improve nail function, blood sugar and gastroscopy to further assist in the diagnosis and treatment. If there is indeed a functional problem, most of them can be relieved by resting, improving sleep, and paying attention to the combination of work and rest.