Fever

Fever is a sign of an underlying medical condition. It is defined as a body temperature higher than the normal range of 98.6°F (37°C). Fever is usually caused by infection, such as a cold, flu, or other virus. Other causes of fever include certain types of allergies, drugs, and some medical conditions. Fevers can range in severity from mild to life-threatening. Treatment for fever usually involves medications to reduce the body temperature, along with supportive care such as rest and fluids.