Case 2: A 66-Year-Old Man With Chronic Watery Diarrhea

The patient had been well until a month before this admission, taking medication well for underlying diseases such as hypertension and diabetes. Diarrhea occurred four weeks before admission to this hospital. Diarrhea was watery, 4 to 5 times a day, even at night, and mild diffuse abdominal pain was accompanied without tenderness. He had no known allergies and had no history of ingestion of contaminated foods or raw meats. He did not take any new medications. Symptoms got worse on the day of visit, which was followed by severe general weakness and weight loss of 4 kg.