What does a fever do in the human body?

A fever plays a significant role in the immune response during an infection or illness. When the body temperature rises, it serves as a defense mechanism against pathogens such as bacteria and viruses. The elevated temperature helps to stimulate the activity of white blood cells, which are crucial for fighting infections. This increased activity allows the immune system to respond more effectively to the invading pathogens.

Additionally, a fever can inhibit the reproduction of certain pathogens, as many bacteria and viruses thrive at normal body temperatures. By raising the body's temperature, the fever creates an unfavorable environment for these pathogens, thereby aiding in the body's healing process. The combination of activating immune cells and impeding pathogen growth illustrates how a fever is an essential part of the body's defense mechanisms during illness.