A mercury thermometer of 37.1°C is not a fever. Clinically, it is prescribed that a temperature above 37.3°C is considered a fever. Mercury thermometers can be placed in different locations to measure body temperature. The normal body temperature range measured in different parts of the body varies. Axillary measurements are normal at 36°C to 37.2°C, oral measurements are normal at 36.3°C to 37.2°C, and anal measurements are normal at 36.5°C to 37.7°C. If the measured temperature exceeds its normal value, it should be regarded as fever, while none of the 37.1°C exceeds the normal range. It is recommended that patients with a mercury thermometer of 37.1°C should pay attention to temperature changes. If the body temperature continues to rise, it cannot be ruled out that it is related to pathological factors, so it is necessary to go to the hospital for examination in time.