7 Causes of Persistant Low Grade Fever What does a low-grade fever mean? If you have a cold, or more commonly the flu, you may have a fever as well, but not all are the same. Fevers are defined as any body temperature above 98.6° F (37° C). Some people may talk about a low-grade fever versus a regular fever or a high-grade fever. These terms are not universally defined, but it is important to monitor the degree of your fever in the context of your cold or flu and take appropriate action to treat.
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