Medically reviewed by Anju Goel, MD Key Takeaways Diarrhea is often contagious, especially when it's caused by viruses, bacteria, or parasites. Infectious diarrhea can spread by not washing hands ...

Medically reviewed by Robert Burakoff, MD Key Takeaways Diarrhea is often caused by infections, including bacterial, viral, or parasitic.Food poisoning can trigger diarrhea if you eat food ...