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what area of the back? pain since when? any injury or accident history?

Yes, blood donation is good for health. Some studies have shown a decrease in Cancer risk, as well as decrease in the damage to the liver and pancreas in the long run. One should definately donate blood, ofcourse after the entire pre-requisites are cleared.

Usully, fever is accompanied with increase in the body's temperature, weakness and body ache. Incase you feel any of these symptoms, you can take a Paracetamol. If the fever doesn't subside or keeps reoccuring, contact your doctor immediately.