Fever temperature is a common physiological reaction to infection or inflammation. When the body's immune system kicks in to fight off harmful pathogens, it often elevates its core temperature. This increase can be measured using a thermometer and usually falls within a band of 100.4°F (38°C) or hig

A fever suggests that your body is combating an illness. When you get sick, your immune system kicks into gear, raising your body temperature to assist in destroying the harmful germs causing the sickness. While a fever can be uncomfortable, it's generally a positive sign that your body is working