Does a temperature of 37.3°C constitute a fever in elderly individuals?

　　A measured axillary temperature of 37.3°C in elderly individuals represents mild fever. Since baseline body temperature tends to be lower in older adults, even a slight elevation warrants attention. If the elevated temperature persists after ruling out confounding factors—such as environmental heat, recent food intake, or physical activity—it may indicate an underlying infection. Accompanying symptoms such as lethargy and a sudden loss of appetite necessitate prompt medical evaluation to identify the cause.

　　Metabolism slows with age, resulting in a generally lower baseline body temperature among older adults compared to younger and middle-aged individuals; therefore, standard fever thresholds for younger adults should not be applied uncritically. Transient, minor temperature increases may occur following exposure to hot environments, after meals, or post-physical activity—but these typically normalize upon rest and re-measurement. If repeated measurements consistently show 37.3°C after excluding such transient causes, it suggests an inflammatory response. Notably, some elderly patients with infection may not develop high-grade fever but instead present only with low-grade fever.

　　When this temperature is observed, prioritize increasing fluid intake, loosening clothing, ensuring adequate room ventilation, and regularly rechecking temperature. Avoid rushing to administer antipyretics. Instead, closely monitor mental status, appetite, and respiratory function. In certain elderly patients, low-grade fever may be the sole presenting sign of infection; overlooking such subtle changes risks delaying diagnosis and treatment—do not dismiss the significance of mild fever simply because the temperature elevation is modest.

　　In daily life, maintain appropriate indoor temperature control and remain vigilant for changes in the elder’s mental alertness and appetite. Ensure a light, balanced diet, sufficient sleep, and protection against cold exposure and excessive fatigue—thereby supporting baseline physiological resilience and reducing susceptibility to infections.