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This article is from the WebMD Feature Archive

What Causes Diarrhea?

Diarrhea is inconvenient, unpleasant, and happens to nearly everyone. Of all reported illnesses in the U.S., diarrhea is the second most common. The average adult has diarrhea four times a year. American children typically have seven to 15 cases of diarrhea by the time they reach age five.

Everyday things such as food, medication, or stress can cause diarrhea. However, diarrhea sometimes may signal an underlying medical condition. If diarrhea keeps you running for the toilet, read on to learn about some common triggers and how you can cope.

Bacterial Causes of Diarrhea

Bacteria are part of everyday life, and normally bacteria and humans live together peacefully. However, some bacteria can wreak havoc on your digestive well-being. These tiny bugs find fertile breeding ground in raw meats, eggs, shellfish, and unpasteurized milk.

Cases of food contamination causing diarrhea are rare in the U.S., says Alexander Rapisarda, MD, a specialist in gastroenterology and hepatology at Robert Wood Johnson University Hospital in East Brunswick, N.J. He tells WebMD, “The most common food-related cases of diarrhea come from food that was not refrigerated well enough or went bad before the patient ate it.”

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