According to doctors, fever is detected when your body temperature is slightly elevated – between 98.7°F and 100.4°F (37.05°C and 38.0°C) - and lasts for more than 24 hours.

A fever that lasts more than 24 hours should be immediately addressed. If it goes beyond three or four days, one should see a doctor regardless of other symptoms.

A persistent low-grade fever isn’t usually cause for concern. It will typically go away on its own but may be serious for people like infants and those with immune conditions.