By James Broomfield, MD Diarrhea is the passage of watery stools. The key symptom of diarrhea is frequent bouts of loose, watery stools.
Viruses cause most episodes of diarrhea.
When children get these viral infections, they can have severe bouts of diarrhea. Some people get diarrhea often. A traveler who has developed persistent diarrhea should call his or her healthcare provider for advice. Frequent hand washing with soap and warm water is the best way to prevent diarrhea. This is especially important if a person has been exposed to anyone who has diarrhea or has used a public restroom.