Is a body temperature of 37°C normal?

A body temperature of 37°C is considered normal. Body temperature—the internal temperature of the human body—is generated as a byproduct of metabolic processes that convert nutrients into thermal energy. Maintaining a stable core temperature is essential for ensuring normal metabolism and physiological function. Normal body temperature is not a single fixed value but rather falls within a defined range.

Normal reference ranges are as follows: sublingual (oral) temperature: 36.3–37.2°C; rectal temperature: 36.5–37.7°C (approximately 0.2–0.5°C higher than oral temperature); axillary (underarm) temperature: 36.0–37.0°C. These standard values are derived from population-based measurements and represent typical—not absolute—values for individuals. Body temperature may fluctuate in response to physiological states or environmental factors, but such variations generally remain within the normal range. However, a temperature exceeding 38.1°C is classified as fever (high-grade fever), and medical consultation is recommended; treatment with appropriate antipyretic medications should be undertaken under a physician’s guidance.