However, experts say there can be many other less common causes of a persistent low-grade fever that only a doctor can diagnose. A few of these, include: Your body temperature may increase to help ...

ANSWER: The body’s immune system is constantly fighting a war against pathogens such as viruses, bacteria and even parasites. The immune system is very good and “wins” most of the time, but you are ...

"In most cases, a serious infection will progress from a low-grade fever to a temperature of 100.5°F or greater within a day," Madsen says. But infections aren't the only cause of low-grade fevers.