Question: A 58-year-old man was admitted to the Gastroenterology Department because of persistent watery diarrhea for 4 months. Four months ago, the patient began to suffer from 8–10 episodes of watery diarrhea per day without an obvious cause, and the diarrhea did not cease with fasting. He denied abdominal pain, nausea, vomiting, fever, and so on. He lost about 15 kg in the past 4 months. He had no history of long-term medication use. Physical examination revealed hyperactive bowel sounds (10 times/min) and bilateral pedal edema.
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