The most widely known definition of a fever is when a person’s body temperature runs over 98.6°F, the average body temperature for most people.iv However, a fever can be broken down into further categories based on temperature, and one of those categories is “low-grade”. Healthcare professionals define a low-grade fever as a body temperature of 99.6°F to 100.3°F. A low-grade fever is usually a sign that your body is fighting off the infection that has caused your temperature to rise, but most likely won’t need medical attention.v One important thing to note is that body temperature can fluctuate by one or two degrees from various factors such as stress or heavy clothing, and even medications can have an effect on the body’s temperature.vi