Fever of Unknown Origin
(FUO; Pyrexia of Unknown Origin)
- A common illness that does not have the usual symptoms
- Illness with other symptoms that may appear later
- Illnesses that may have a delayed positive test
- Person is unable to communicate about other symptoms such as an infant or someone in a coma
- Genetic condition that causes periodic fevers—rare
- Were you traveling abroad?
- Were you hospitalized?
- Is your immune system damaged?
- What medications are you currently taking?
- Blood tests
- Urine tests
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Family Doctor—American Academy of Family Physicians http://familydoctor.org
Healthy Children—American Academy of Pediatrics http://www.healthychildren.org
Caring for Kids—Canadian Paediatric Society http://www.caringforkids.cps.ca
Health Canada http://www.hc-sc.gc.ca
Roth A, Basello G. Approach to Adult Patient with Fever of Unknown Origin. Am Fam Physician. 2003 Dec 1;68(11):2223. Available at: http://www.aafp.org/afp/2003/1201/p2223.html. Accessed September 25, 2014.
Fever of Unknown Origin (FUO). EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated August 29, 2014. Accessed September 25, 2014.
- Reviewer: Michael Woods, MD
- Review Date: 08/2014 -
- Update Date: 09/25/2014 -
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
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