Having a fever is a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't.
Fever is part of your body's defense against infection-causing germs. By itself, fever is usually harmless, though a high fever can be miserable.
A fever is a body temperature of F or greater. Read about causes of fever in adults, symptoms, treatment, medications that may cause fevers, and different.