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1. • • When a fever lasts for more than three weeks — constantly or on several occasions — and there is no clear cause, it's usually called a fever of unknown origin. In these cases, you may need to see specialists in one or more medical fields for further evaluations and tests.
     www.mayoclinic.org/diseases-conditions/fever/diagnosis-treatment/drc-20352764

     Fever - Diagnosis & treatment - Mayo Clinic

2. www.aafp.org › pubs › afpFever of Unknown Origin in Adults | AAFP

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   Fever of unknown origin is defined as a clinically documented temperature of 101°F or higher on several occasions, coupled with an unrevealing diagnostic workup. The differential diagnosis is...

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     Fever of unknown origin (FUO) in adults is defined as a...

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     Fever of Unknown Origin in Adults. Aïsha David, Jeffrey D....

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     Zenone T. Fever of unknown origin in adults: evaluation of...

3. www.mayoclinic.org › diseases-conditions › feverFever - Diagnosis & treatment - Mayo Clinic

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   May 7, 2022 · Fever of unknown origin. When a fever lasts for more than three weeks — constantly or on several occasions — and there is no clear cause, it's usually called a fever of unknown origin. In these cases, you may need to see specialists in one or more medical fields for further evaluations and tests.

4. www.ncbi.nlm.nih.gov › books › NBK532265Fever of Unknown Origin - StatPearls - NCBI Bookshelf

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   Aug 14, 2023 · Outline the causes for fever of unknown origin. Summarize the treatment of patients with fever of unknown origin. Review the importance of improving care coordination among interprofessional team members to improve outcomes for patients affected by fever of unknown origin.

   • Author: Ilona Brown, Nancy A. Finnigan
   • Published: 2023/08/14

   • Publish Year: 2021

5. www.uptodate.com › contents › fever-of-unknownFever of unknown origin in adults: Evaluation and management

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   Nov 28, 2023 · Clinicians commonly refer to a febrile illness without an initially obvious etiology as fever of unknown origin (FUO). However, most febrile illnesses either resolve before a diagnosis can be made or develop distinguishing characteristics that lead to a diagnosis.

6. www.merckmanuals.com › fever-of-unknown-origin-fuoFever of Unknown Origin (FUO) - Fever of Unknown Origin (FUO ...

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   Jul 9, 2024 · Fever of unknown origin (FUO) is body temperature ≥ 38.3° C (≥ 101° F) rectally that does not result from transient and self-limited illness, rapidly fatal illness, or disorders with clear-cut localizing symptoms or signs or with abnormalities on common tests such as chest radiograph, urinalysis, or blood cultures.

   • Author: Larry M. Bush

7. www.healthline.com › health › fever-of-unknown-originAbout Fever of Unknown Origin - Healthline

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   Aug 31, 2018 · Many fevers of unknown origin are impossible to diagnose, and they can resolve without treatment. Nevertheless, a fever lasting three weeks or more can indicate a serious health issue.

8. People also ask

   What is a fever of unknown origin?

   • Fever of unknown origin is defined as a clinically documented temperature of 101°F or higher on several occasions, coupled with an unrevealing diagnostic workup. The differential diagnosis is broad but is typically categorized as infection, malignancy, noninfectious inflammatory disease, or miscellaneous.

   Fever of Unknown Origin in Adults - AAFP

   www.aafp.org/pubs/afp/issues/2022/0200/p137.html

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   What are the different types of fever of unknown origin?

   • There are four classifications of fever of unknown origin: 1. Classic FUO – this is an unexplained fever that lasts for three weeks. Infections or neoplasms such as leukaemia may be the cause. Other disorders that can affect connective tissue may also be the cause. 2.

   Fever of unknown origin: what is it, symptoms and treatment - Top Doct…

   www.topdoctors.co.uk/medical-dictionary/fever-of-unknown-origin

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   What is a recurrent fever of unknown origin (FUO)?

   • Recurrent fever of unknown origin (FUO): aseptic meningitis, hepatosplenomegaly, pericarditis and a double quotidian fever due to juvenile rheumatoid arthritis (JRA). [Heart Lung. 2012] Fever of unknown origin (FUO). II. Diagnostic procedures in a prospective multicenter study of 167 patients. The Netherlands FUO Study Group.

   Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov/books/NBK532265/

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   What causes fever of unknown origin (FUO)?

   • The causes of fever of unknown origin (FUO) are often common conditions presenting atypically. The list of causes is extensive, and it is broken down into broader categories, such as infection, noninfectious inflammatory conditions, malignancies, and miscellaneous. Noninfectious Inflammatory Causes of FUO Infectious Causes of FUO

   Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov/books/NBK532265/

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   How many cases of fever of unknown origin are there?

   • Mansueto P, Di Lorenzo G, Rizzo M, Di Rosa S, Vitale G, Rini G, Mansueto S, Affronti M. Fever of unknown origin in a Mediterranean survey from a division of internal medicine: report of 91 cases during a 12-year-period (1991-2002). Intern Emerg Med. 2008 Sep;3(3):219-25. [PubMed]

   Fever of Unknown Origin - StatPearls - NCBI Bookshelf

   www.ncbi.nlm.nih.gov/books/NBK532265/

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9. www.topdoctors.co.uk › fever-of-unknown-originFever of unknown origin: what is it, symptoms and treatment ...

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   Jan 14, 2014 · Typical symptoms of fever of unknown origin include: A temperature over 38.3°C in adults or 37.5°C in children. Sweating. Chills. Headaches. Body or joint aches. Fatigue. Rash. Cough and sore throat. How is FUO diagnosed? A fever has to last long enough to be classified as FUO.