Old diarrhea diarrhea may be related to drugs, intestinal diseases, systemic diseases, the treatment method is different. 1. Drugs: such as anti-tuberculosis drugs, non-steroidal anti-inflammatory drugs, etc., can lead to diarrhea in patients. Generally speaking, medication diarrhea does not require oral medication for treatment, and the diarrhea will stop on its own after stopping the medication. 2. Intestinal diseases: such as chronic bacillary dysentery, chronic amebic enteritis, chronic schistosomiasis, irritable bowel syndrome, intestinal flora dysbiosis, ulcerative colitis and other intestinal diseases can lead to diarrhea. It is often necessary to combine with the fecal routine, enteroscopy and other auxiliary diagnosis. Treatment should be directed to the cause, such as chronic schistosomiasis, usually choose praziquantel for treatment. 3. Systemic diseases: e.g. hyperthyroidism, cholangiocarcinoma, hepatocellular carcinoma. It is necessary to reasonably treat the underlying disease and use drugs appropriately. Such as hyperthyroidism, you can choose drugs such as methimazole, iodine-131 treatment, surgery and so on. Old diarrhea and diarrhea, you need to consult a doctor in a timely manner, after clarifying the cause of the disease for targeted treatment.