Remittent fever is a condition characterized by recurrent fever and fluctuating temperature. The term "remittent fever" is most commonly used in medical settings, but other terms can indicate similar symptoms. For example, the term "relapsing fever" is sometimes used to describe a similar pattern of fever that comes and goes in cycles. The term "intermittent fever" describes a similar pattern of fever that recurs but with breaks between the episodes. Similarly, "undulant fever" describes a gradual rise and fall in body temperature with peaks and valleys. Other terms that may be used include "recurrent fever," "cyclic fever," and "fever of unknown origin." Each of these terms may indicate a similar pattern of fever that requires medical attention.