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Definition of gastroenteritis
Gastroenteritis (often referred to as the "stomach flu," however, it is not related to the influenza virus. Gastroenteritis is a nonspecific term for various inflammatory problems in the gastrointestinal tract with the most common symptoms and signs being diarrhea, nausea, vomiting, and abdominal pains.
As previously mentioned, although it is not caused by influenza viruses, gastroenteritis is commonly referred to as the "stomach flu" because most people have acute symptoms that last a day or so, and then begin to resolve, like the symptoms of more benign flu strains. In the U.S., less than 2% of the estimated 100 million persons with gastroenteritis symptoms per year ever require hospitalization, but in developing countries it is a leading cause of death, mainly due to dehydration. Severe gastroenteritis can cause dehydration. Also, people with symptoms of diarrhea, bloody diarrhea, fever greater than 101 F (38.33 C) for longer than 5 days, or have severe infection (sepsis), and other problems will be considered to have another disease (for example, shigellosis). Not all doctors agree on the nonspecific term of gastroenteritis so for this article, the parameters are presented that comprise the causes and symptoms that many researchers consider to occur with gastroenteritis.