The flu, or influenza is is a viral infection that mimics a cold except that it starts forcefully with symptoms of fatigue, fever, and respiratory congestion, can lead to pneumonia and is caused by influenza types A, B, or C. Influenza is your common cold on steroids. In other words, a common cold is Sheldon from Big Bang Theory - influenza is Chuck Norris.
Stomach flu should really be referred to as Gastroenteritis -this is what causes abdominal cramping, stomach pain, nausea, vomiting and diarrhea.
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