The term 'Hot and Cold Fits' is a medical condition known as AGUE, which is a four-letter word. AGUE is a feverish illness that is characterized by alternating hot and cold fits, or episodes of shivering and sweating. It is caused by a variety of infectious diseases, such as malaria, typhoid, and influenza. Symptoms include chills, fever, headache, fatigue, and muscle aches. Treatment typically involves rest, fluids, and medications to reduce fever and relieve symptoms.