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Why do we feel tired when we have fever.

If fever is present in the body, an infection is present somewhere. The type of infection which also causes fatigue and other symptoms is generally a systemic variety rather than one that is localized in one location.Many infections cause both fever and fatigue because the body’s immune system is working hard to fight off the infection. The temperature begins to rise in an attempt to kill bacteria and viruses, thus causing the fever. Patients often feel tired and fatigued because of this extra energy being exerted by the body, which may encourage them to rest and conserve energy. If vomiting and diarrhea are also present, dehydration may also cause fatigue as well as lowered electrolyte levels.


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