Abnormal body temperature, also known as FEVER, is a medical condition in which the body temperature rises above the normal range of 36.5–37.5°C (97.7–99.5°F). FEVER is usually caused by an infection or inflammation and is a sign that the body is fighting off the infection. It can also be caused by certain medications, heat exhaustion, or other medical conditions. Treatment for FEVER typically involves rest, fluids, and medications to reduce the body temperature.