Diarrhea, a commonly-encountered splenogastric disorder, is marked by increased frequency of defecation with thin or watery stool. It pertains to the categories of "indigestion", "infantile enteritis", etc. in modern medi- cine. Diarrhea may occur in all seasons of a year, especially in summer and autumn. The attack in autumn and winter is liable to be epidemic. Infants below the age of 3 is subject to a higher incidence. The disease has a favourable prognosis. But the patients with weak physique, acute attack of the disease, failure to be treated or delayed treatment are susceptible to changes of the disease or lingering and intractable diseases, which may transform into infantile malnutrition or chronic infantile convulsion.