Ague is a term used to describe a fever and chills, which are common symptoms of many illnesses. It is an old-fashioned word that is still used in some parts of the world to refer to a fever with shivering and sweating. AGUE is usually caused by a virus or bacteria, and can be accompanied by other symptoms such as headache, fatigue, and body aches. Treatment for AGUE typically involves rest, fluids, and medications to reduce fever and relieve discomfort.