Wikipedia:
low-grade fever
In medicine, low-grade fever is a continuous or fluctuating low fever, typically defined as never exceeding 38.5 degrees Celsius (about 101 degrees Fahrenheit). It is a non-specific finding, but occurs in many diseases, ranging from infectious (viral infections or infective endocarditis) to autoimmune to malignant causes.
A persistent low grade fever can be a sign of many sicknesses.
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