Treating a fever. Fever is part of your body's defense against infection-causing germs. By itself, fever is usually harmless, though a high fever.
A healthy adult with a slight fever may feel like they've been hit with a level and symptoms can help you decide how to treat a fever.
A fever is a body temperature of 100.4 F or greater. Read about causes of fever in adults, symptoms, treatment, medications that may cause fevers, and different.