Diarrhea can be determined by >3 stools/day, liquid stools or stools totaling >200g/day, and stools containing >80% water. Diarrhea is defined as increased frequency of defecation, thin feces, or with pus and blood, mucus and undigested food. Clinically, it can be divided into acute diarrhea and chronic diarrhea. Acute diarrhea can be seen in viral and bacterial infections caused by enteritis, but also in food and drug poisoning, sepsis, and allergic enteritis. Chronic diarrhea can be seen in chronic atrophic gastritis, intestinal tuberculosis, chronic pancreatitis, cirrhosis of the liver, as well as intestinal tumors, ulcerative colitis and other digestive disorders, but also can be seen in hyperthyroidism, irritable bowel syndrome and other systemic diseases. When diarrhea occurs, please consult a doctor in time to identify the cause of the disease and take medication under the guidance of a physician.