Thermic fever, also known as heat stroke, is a condition that occurs when the body's temperature regulation system fails to maintain a normal body temperature. There are several synonyms for thermic fever, including sunstroke, heat exhaustion, hyperthermia, and heat stress. Sunstroke is a type of thermic fever that occurs when the body becomes overheated from direct exposure to the sun. Heat exhaustion is a less severe form of thermic fever that results from prolonged exposure to high temperatures. Hyperthermia refers to an abnormally high body temperature, while heat stress is a general term used to describe the body's response to excessive heat. Regardless of the specific synonym used, thermic fever is a serious condition that requires immediate medical attention.