Is fever an immune system response?

Yes, fever is an immune system response.

When the body is invaded by pathogens such as bacteria or viruses, the immune system responds by increasing the body's temperature. This is because many pathogens cannot survive in high temperatures. The elevated temperature also helps to speed up the body's metabolic processes, which can help to fight off the infection.

Fever is a normal part of the immune system's response to infection, but it can also be a sign of a serious underlying medical condition. If you have a fever, it is important to see a doctor to determine the cause and get appropriate treatment.