Gastroenteritis describes a group of conditions usually caused by infection with a microorganism (viral or bacterial) or ingestion of chemical toxins. Gatroenteritis usually consists of mild to severe diarrhea that may be accompanied by loss of appetite, nausea, vomiting, cramps, and discomfort in the abdomen. Although gastroenteritis usually is not serious in a healthy adult, causing only discomfort and inconvenience, it can cause life-threatening dehydration and electrolyte imbalance in the very ill, the very young, and the very old.

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Dorland's Medical Dictionary for Healthcare Consumers
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The Merck Manual—Home Edition
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