Diarrhea for more than 2 months is called chronic diarrhea, can lead to chronic diarrhea of more than three diseases, intestinal tuberculosis, chronic bacillary dysentery and other digestive diseases; hyperthyroidism, diabetic enteropathy, gastrinoma and other systemic diseases can lead to chronic diarrhea. 1. Gastrointestinal diseases: such as intestinal tuberculosis, chronic bacillary dysentery, chronic amoebic dysentery, Crohn’s disease, ulcerative colitis, colonic polyps, intestinal malignant tumors and other diseases can lead to chronic diarrhea. 2. Systemic diseases: such as hyperthyroidism, hypoadrenocorticism, diabetic enteropathy, gastrinoma can occur in a variety of diseases chronic diarrhea. Chronic diarrhea may also have other causes, if the above symptoms occur repeatedly, it is recommended to go to the hospital to improve the colonoscopy and other tests to determine the cause of the disease, so as not to delay the condition.