In a patient presenting with fever;
if the fever continues for more than 3 weeks, exceeds 38.3 °C in more than one
measurement and the cause cannot be determined despite all efforts, this
situation is referred to as “ Fever of Unknown Origin” (FUO). In this section,
the causes, diagnostic methods and treatment rules of FUO, whose incidence has
decreased in recent years thanks to the advancements in medical facilities,
were examined. It was tried to emphasize that FUO cases should be evulated
multidisciplinaryly and empirical treatment should be avoided except for
special patient groups.
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