Fever in Adults (cont.)
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Most fevers will go away in a few days with the appropriate treatment. It is important to follow up with the health-care professional to be sure the cause of the fever is treated correctly. This may be done in a few days to weeks after the initial visit, depending on the cause.
If symptoms worsen, if the fever continues for more than three days despite treatment, or if the fever lasts longer then a week without treatment, see the doctor immediately.
Follow-up is very important especially for people with fevers due to cancer, drug-induced fevers, infectious causes, FUOs, or hormone problems, since these people may experience relapses and repeated treatments. In some cases, hospitalization may be required.
Medically Reviewed by a Doctor on 2/17/2015
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Fever of unknown origin (FUO) was defined in 1961 by Petersdorf and Beeson as the following: (1) a temperature greater than 38.3°C (101°F) on several occasions, (2) more than 3 weeks' duration of illness, and (3) failure to reach a diagnosis despite one week of inpatient investigation.