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When you have a cold or flu, the doctor (or Dr. Mom) may tell you to drink lots of fluids. But did they ever explain why you need to guzzle all that water and juice?The extra fluid helps prevent dehydration, which can make you feel even worse, and make it harder to get well.
When immune cells detect an infectious organism, they produce fever-making chemicals. These chemicals prompt the body to produce prostaglandins, which turn up the thermostat in the brain.