Continued fever is a prolonged illness that lasts for more than a few days without any significant improvement. Synonyms for continued fever include pyrexia, sustained fever, high fever, prolonged fever, and persistent fever. Pyrexia is a medical term used to describe an elevated body temperature consistent with a fever. Sustained fever, high fever, and prolonged fever all refer to fevers that persist beyond a normal fever duration. Persistent fever is a term used when the fever continues despite medical interventions. Other synonyms include remittent fever, which is characterized by fluctuations of fever, and hectic fever, which is a fever that follows a specific pattern throughout the day.