The most common types of bacteria that can cause diarrhea include: The biggest indicator that diarrhea is contagious is that it comes on quickly. "Things like that can clue you in—it comes on ...

Q. I seem to get diarrhea more often now than I used to when I was younger. Any ideas why? A. Before I offer you some general information about diarrhea, I urge you to see a doctor for a ...