Fever is a common medical condition characterized by an elevated body temperature, typically above 100.4°F (38°C). It often signifies that the body is fighting an infection or illness, as the increase in temperature helps to enhance the immune response. Fever can be caused by a variety of factors, including viral or bacterial infections, inflammatory conditions, or other underlying health issues.

While often not serious and manageable with rest and fluids, persistent or very high fever may require medical attention to identify and address the underlying cause. Monitoring other symptoms and seeking medical advice when necessary is crucial for effective treatment and recovery.