Is 38°C considered a fever?
Sep 16, 2025
Source: Cainiu Health
Dr. Yang Ziqi
Introduction
In general, a body temperature of 38°C is considered a fever and falls within the moderate fever range. However, the determination should take into account the measurement site and the individual's overall physical condition; a single temperature reading alone should not be used as the sole basis for diagnosis. If a fever is confirmed and accompanied by discomfort, symptoms can be alleviated through methods such as tepid water擦拭 (sponge bathing), increased intake of warm water, etc. Additionally, it is important to rest adequately and avoid excessive fatigue to assist the body in returning to its normal state.
Generally speaking, a body temperature of 38°C is considered a fever and falls within the moderate fever range. However, whether it constitutes a fever should be determined by considering both the measurement site and the individual's physical condition; conclusions should not be based solely on a single temperature reading. Detailed analysis is as follows:
From the perspective of standard body temperature ranges, normal values vary depending on the measurement site. The normal axillary (underarm) temperature ranges from 36.0–37.2°C, oral (mouth) temperature from 36.3–37.2°C, and rectal (anal) temperature from 36.5–37.7°C. If the measured temperature is 38°C at the axilla or orally, it exceeds the normal range and indicates a fever. However, if measured rectally, 38°C still falls within the normal range and does not constitute a fever. Therefore, the measurement site is a key factor in interpretation.
If the temperature reaches only 38°C without symptoms such as headache, fatigue, or coughing, the slight elevation may be due to physiological factors such as a hot environment or vigorous exercise, causing temporary increases in body temperature that typically return to normal after rest. However, if the elevated temperature is accompanied by obvious discomfort, it is more likely caused by pathological factors such as infection, requiring further observation or medical attention.
In daily life, it is important to consistently use the same measurement site and ensure correct measurement techniques. If a fever is confirmed and accompanied by discomfort, symptoms can be alleviated through methods such as wiping the body with lukewarm water and drinking plenty of warm fluids. Adequate rest and avoiding excessive fatigue are also essential to help the body recover to its normal state.
