Why do we get fevers?

Fever is the body’s natural defense response to infection or illness. When pathogens invade, the immune system releases chemicals called pyrogens that signal the brain’s hypothalamus to raise body temperature. The higher temperature makes it harder for bacteria and viruses to survive while boosting immune efficiency. Fevers often accompany infections such as colds, flu, or bacterial illnesses. Mild fevers are usually beneficial and self-limiting, but very high or persistent fevers can signal serious conditions like sepsis or inflammatory diseases. Staying hydrated and resting are key while treating the underlying cause.