Is 35.5℃ considered a low-grade fever?
Low-grade fever refers to mild fever. A temperature of 35.5°C is usually not considered a low-grade fever, but rather indicates subnormal body temperature, which warrants attention to one's health status.
The normal axillary (underarm) body temperature range for humans is 36.0–37.2°C. A temperature of 35.5°C does not qualify as a low-grade fever but instead reflects a below-normal temperature. This may result from recently coming in from a cold environment, wearing excessive clothing, or taking antipyretic medications, among other causes of temporary hypothermia. Generally, there is no need for excessive concern if no other discomfort symptoms are present.

Although 35.5°C does not constitute a low-grade fever, a body temperature below the normal range may still indicate underlying health issues. Particularly if accompanied by symptoms such as chills, fatigue, dizziness, or slowed heart rate, it is advisable to seek medical evaluation promptly to determine whether any health problems exist.
It is recommended to measure body temperature multiple times and observe whether any additional symptoms are present. Consult a doctor when necessary to obtain professional diagnosis and guidance. If any physical discomfort occurs, prompt medical attention at a hospital is advised, followed by treatment according to medical instructions.