Is a body temperature of 37.5°C considered a fever?
Jul 22, 2025
Source: Cainiu Health
Dr. Yang Ziqi
Introduction
In general, whether a body temperature of 37.5°C constitutes a fever should be determined by considering the measurement site, individual variation, and clinical context. Typically, normal axillary (underarm) body temperature ranges from 36.0 to 37.2°C, oral (mouth) temperature ranges from 36.3 to 37.2°C, and rectal (anal) temperature ranges from 36.5 to 37.7°C. If measured axillary or orally, 37.5°C is slightly above the normal range and is considered a low-grade fever.
Generally speaking, whether a body temperature of 37.5°C constitutes a fever should be determined by considering the measurement site, individual differences, and clinical context. Detailed analysis is as follows:
Typically, normal body temperature ranges are as follows: armpit temperature ranges from 36.0 to 37.2°C, oral temperature from 36.3 to 37.2°C, and rectal temperature from 36.5 to 37.7°C. If measured under the armpit or orally, 37.5°C is slightly above the normal range and is considered a low-grade fever. If measured rectally, it falls within the normal range. Additionally, body temperature can physiologically fluctuate—for example, it may slightly increase in the afternoon, after eating, after physical activity, or during a woman's ovulation period. If no other discomfort is present, this may indicate physiological low-grade fever and generally does not require excessive concern.
Assessing whether a fever is present should also consider associated symptoms: if accompanied by fatigue, sore throat, coughing, or other discomforts, it may suggest infection or inflammation. If only a single reading is slightly elevated with no other abnormalities, it is advisable to retake the temperature after 30 minutes to 1 hour to monitor any changes.
In daily life, it is important to maintain healthy lifestyle habits and avoid consuming spicy or irritating foods such as pepper, chili peppers, and garlic, which may hinder recovery.
