What is the main symptom of disease?

Fever is the main symptom of disease.

Fever is a body's natural response to an infection. It is a way for the body to raise its temperature in order to kill off the bacteria or viruses that are causing the infection. Fever can also help to speed up the healing process by increasing blood flow to the infected area and by stimulating the production of white blood cells.

While fever can be a sign of a serious infection, it is important to remember that it is also a normal part of the healing process. In most cases, fever will go away on its own within a few days. However, if a fever is accompanied by other symptoms, such as rash, vomiting, or diarrhea, it is important to see a doctor right away.