Chronic diarrhea is usually caused by gastrointestinal dysfunction or organic damage, as well as liver and gallbladder diseases, which lead to an increase in the number of stools, presenting watery stools, mucus, pus and blood stools, and so on. 1. Dysfunction: some people will have chronic diarrhea on milk, eggs and other foods, mainly because of the lack of appropriate digestive enzymes in the body, poor digestive function, eating milk and other foods will have diarrhea. Intestinal infection with bacteria, parasites, etc., affecting the normal function of the gastrointestinal tract, gastrointestinal tract peristalsis is too fast, can not absorb the gastrointestinal tract in a timely manner, there will be unshaped stools, stools more often. 2. Organic damage: ulcerative colitis, gastric ulcer, gastritis and other diseases, due to inflammation stimulation of the gastrointestinal mucosa exudate fluid, it will lead to increased moisture in the stool, chronic diarrhea. 3. Hepatobiliary diseases: cholecystitis, cirrhosis and other diseases of the liver and gallbladder system, due to insufficient bile secretion or excretion, eating fat can not be digested and absorbed, it will be manifested as chronic diarrhea. There are many reasons for chronic diarrhea, you should consult a doctor in time to clarify the cause of the disease and carry out the necessary treatment under the guidance of the doctor to avoid delaying the condition.