Is 37.5°C considered a low-grade fever or normal?

Generally, a rectal temperature of 37.5°C falls within the normal range, but an oral or axillary temperature of 37.5°C is considered a low-grade fever. It is recommended to seek medical attention promptly and receive appropriate treatment under a doctor's guidance. Detailed explanations are as follows:

The normal rectal temperature range for a healthy individual is 36.5°C to 37.7°C. Axillary (underarm) temperature typically falls between 36°C and 37°C, while the normal oral (mouth) temperature range is 36.3°C to 37.2°C. A low-grade fever for oral and axillary temperatures is generally defined as 37.3°C to 38°C, so 37.5°C falls within the low fever range. When the body is infected by viruses or bacteria, the immune system is activated and releases endogenous pyrogens such as interleukins, causing the hypothalamus to raise the body's temperature set point, thereby resulting in fever.

However, some non-pathological factors may also cause the body temperature to reach 37.5°C. For example, women may experience a slight increase in body temperature during ovulation. Body temperature may also temporarily rise after intense physical activity or during emotional excitement due to increased metabolic rate. If the low-grade fever is caused by a disease, it may be accompanied by other symptoms such as coughing, fatigue, or headache. In such cases, it is recommended to initially apply physical cooling methods, such as wiping the forehead, armpits, and groin areas with warm water, to help reduce body temperature, while also drinking more water and resting adequately.

If the temperature continues to rise or more severe symptoms develop, it is recommended to visit a hospital promptly for relevant examinations, such as physical examination, vital signs monitoring, and laboratory tests.