What is diarrhea? Diarrhea is loose, watery stools three or more times a day. Diarrhea may be acute, persistent, or chronic: How common is diarrhea? Diarrhea is a common problem. Acute diarrhea is more common than persistent or chronic diarrhea. Researchers estimate that about 179 million cases of acute diarrhea occur in the United States each year.1 What are […]