Is 37.7°C considered a fever?

Generally speaking, fever refers to an elevated body temperature, and 37.7°C is considered a fever. The detailed analysis is as follows:

The normal human body temperature varies depending on the measurement site. Typically, the normal axillary (underarm) temperature ranges between 36.0°C and 37.0°C, oral (mouth) temperature ranges between 36.3°C and 37.2°C, and rectal (anal) temperature ranges between 36.5°C and 37.7°C. Therefore, whether measured under the arm or in the mouth, a temperature of 37.7°C exceeds the normal range and indicates a fever. A body temperature between 37.3°C and 38.0°C falls within the low-grade fever range; thus, 37.7°C lies precisely in this category. This level of fever usually suggests that the body is responding to certain stimuli—possibly due to viral or bacterial infection, or other stress conditions such as excessive fatigue or emotional stress. The individual may also experience symptoms like mild headache, fatigue, muscle aches, and loss of appetite. These discomforts occur because during fever, the body's metabolism accelerates and the immune system becomes more active, consuming more energy and nutrients, while also affecting the functions of the nervous and digestive systems. It is important to monitor one’s condition and take appropriate measures, such as drinking more water and resting. If symptoms persist or worsen, medical attention should be sought promptly.

In daily life, maintaining good hygiene habits, eating a balanced diet, getting sufficient rest, and engaging in moderate exercise can help strengthen immunity and prevent illness.