What temperature on a thermometer indicates a fever?

The definition of fever depends largely on the measurement site. Generally, a temperature higher than 37.3°C measured under the armpit, higher than 37.3°C measured orally, or higher than 37.6°C measured rectally is considered a fever. 1. The normal axillary (underarm) body temperature is 36–37°C; exceeding 37.3°C suggests possible fever. 2. The normal oral (mouth) body temperature ranges from 36.3–37.2°C; exceeding this range indicates a fever. 3. The normal rectal (anal) body temperature ranges from 36.5–37.7°C; exceeding 37.7°C is considered a fever. Body temperature can vary among individuals due to individual differences, time of day, season, and other factors. When measuring body temperature, ensure the correct measurement method and sufficient measurement time to obtain an accurate reading. If in doubt, seek medical advice promptly.