High temperatures, also known as FEVERS, are a common symptom of many illnesses and can be caused by a variety of factors. FEVERS occur when the body's temperature rises above its normal range, usually due to an infection or other medical condition. FEVERS can range from mild to severe and can be accompanied by other symptoms such as chills, sweating, and fatigue. Treatment for high temperatures typically involves rest, fluids, and medications to reduce the fever.