Fever of unknown origin - Revision history

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	'''Fever of Unknown Origin''' (FUO) refers to a condition in which a patient has an elevated temperature (fever) exceeding 38.3°C (101°F) on several occasions over a period of more than three weeks, without an established diagnosis after initial investigation. The concept of FUO was first defined in 1961, aiming to categorize patients who presented a diagnostic challenge to clinicians. Over the years, the criteria have been refined, but the essence remains the exploration of a persistent fever without a clear cause.

			{{Infobox medical condition
			\| name = Fever of unknown origin
			\| synonyms = FUO
			\| field = [[Infectious disease]]
			\| symptoms = [[Fever]], [[malaise]], [[sweating]], [[chills]]
			\| complications = [[Sepsis]], [[organ failure]]
			\| onset = Varies
			\| duration = More than 3 weeks
			\| causes = [[Infection]], [[neoplasm]], [[autoimmune disease]], [[drug fever]]
			\| risks = [[Immunocompromised]] state, [[travel]] to endemic areas
			\| diagnosis = [[Blood culture]], [[imaging studies]], [[biopsy]]
			\| differential = [[Tuberculosis]], [[endocarditis]], [[lymphoma]], [[connective tissue disease]]
			\| treatment = Depends on underlying cause
			\| medication = [[Antibiotics]], [[antipyretics]], [[corticosteroids]]
			\| prognosis = Varies depending on cause
			\| frequency = Rare
			}}
			'''Fever of Unknown Origin''' (FUO) refers to a condition in which a patient has an elevated temperature (fever) exceeding 38.3¬∞C (101¬∞F) on several occasions over a period of more than three weeks, without an established diagnosis after initial investigation. The concept of FUO was first defined in 1961, aiming to categorize patients who presented a diagnostic challenge to clinicians. Over the years, the criteria have been refined, but the essence remains the exploration of a persistent fever without a clear cause.
	==Etiology==		==Etiology==
	The causes of FUO can be broadly classified into four main categories: [[Infection\|infectious diseases]], [[Neoplasm\|neoplasms]], [[Autoimmune diseases\|autoimmune disorders]], and miscellaneous causes. Infections account for approximately 25-40% of FUO cases and can include entities like [[Tuberculosis]], [[Endocarditis]], and various viral, bacterial, and fungal infections. Neoplasms, or cancers, are responsible for about 20-30% of cases, with [[Lymphoma]] being a common culprit. Autoimmune diseases, such as [[Rheumatoid arthritis]] and [[Systemic lupus erythematosus]], account for another 10-20% of cases. The miscellaneous category includes a wide range of conditions, from [[Thromboembolic disease]] to [[Factitious disorder\|factitious fever]].		The causes of FUO can be broadly classified into four main categories: [[Infection\|infectious diseases]], [[Neoplasm\|neoplasms]], [[Autoimmune diseases\|autoimmune disorders]], and miscellaneous causes. Infections account for approximately 25-40% of FUO cases and can include entities like [[Tuberculosis]], [[Endocarditis]], and various viral, bacterial, and fungal infections. Neoplasms, or cancers, are responsible for about 20-30% of cases, with [[Lymphoma]] being a common culprit. Autoimmune diseases, such as [[Rheumatoid arthritis]] and [[Systemic lupus erythematosus]], account for another 10-20% of cases. The miscellaneous category includes a wide range of conditions, from [[Thromboembolic disease]] to [[Factitious disorder\|factitious fever]].

	==Diagnosis==		==Diagnosis==
	The diagnostic approach to FUO is systematic and often requires a multidisciplinary team. Initial evaluation includes a detailed patient history, physical examination, and basic laboratory tests. Further investigations are guided by clinical suspicion and may involve advanced imaging techniques like [[Computed tomography\|CT scans]] or [[Magnetic resonance imaging\|MRI]], and specialized laboratory tests. In some cases, invasive procedures such as biopsy may be necessary to obtain a definitive diagnosis.		The diagnostic approach to FUO is systematic and often requires a multidisciplinary team. Initial evaluation includes a detailed patient history, physical examination, and basic laboratory tests. Further investigations are guided by clinical suspicion and may involve advanced imaging techniques like [[Computed tomography\|CT scans]] or [[Magnetic resonance imaging\|MRI]], and specialized laboratory tests. In some cases, invasive procedures such as biopsy may be necessary to obtain a definitive diagnosis.

	==Management==		==Management==
	Management of FUO is directed by the underlying cause, once identified. In cases where a specific diagnosis is made, treatment is tailored to the specific condition. For infectious causes, appropriate [[Antibiotic\|antibiotics]] or antiviral medications are prescribed. Neoplasms may require surgery, chemotherapy, or radiation therapy. Autoimmune disorders are often managed with immunosuppressive medications. In a significant number of cases, however, the cause of the fever remains elusive even after extensive investigation, leading to a therapeutic challenge.		Management of FUO is directed by the underlying cause, once identified. In cases where a specific diagnosis is made, treatment is tailored to the specific condition. For infectious causes, appropriate [[Antibiotic\|antibiotics]] or antiviral medications are prescribed. Neoplasms may require surgery, chemotherapy, or radiation therapy. Autoimmune disorders are often managed with immunosuppressive medications. In a significant number of cases, however, the cause of the fever remains elusive even after extensive investigation, leading to a therapeutic challenge.

	==Prognosis==		==Prognosis==
	The prognosis of FUO varies widely depending on the underlying cause. Infections and autoimmune conditions, when identified and treated appropriately, often have a favorable outcome. Neoplastic causes of FUO may have a more guarded prognosis, depending on the type and stage of cancer. In cases where no cause is identified, the approach is often conservative, with symptomatic treatment and close monitoring.		The prognosis of FUO varies widely depending on the underlying cause. Infections and autoimmune conditions, when identified and treated appropriately, often have a favorable outcome. Neoplastic causes of FUO may have a more guarded prognosis, depending on the type and stage of cancer. In cases where no cause is identified, the approach is often conservative, with symptomatic treatment and close monitoring.

	==Epidemiology==		==Epidemiology==
	The incidence of FUO varies globally, influenced by factors such as geographic location, prevalence of certain infectious diseases, and access to healthcare. Advances in diagnostic techniques have led to a decrease in the proportion of cases that remain undiagnosed, but FUO continues to represent a significant clinical challenge.		The incidence of FUO varies globally, influenced by factors such as geographic location, prevalence of certain infectious diseases, and access to healthcare. Advances in diagnostic techniques have led to a decrease in the proportion of cases that remain undiagnosed, but FUO continues to represent a significant clinical challenge.

	==History==		==History==
	The term "Fever of Unknown Origin" was coined by Dr. Petersdorf and Beeson in 1961, setting the initial criteria for the condition. Since then, the definition has evolved, reflecting advances in medical diagnostics. The original criteria focused on hospital inpatients, but subsequent revisions have broadened the scope to include outpatients and specific populations such as immunocompromised patients.		The term "Fever of Unknown Origin" was coined by Dr. Petersdorf and Beeson in 1961, setting the initial criteria for the condition. Since then, the definition has evolved, reflecting advances in medical diagnostics. The original criteria focused on hospital inpatients, but subsequent revisions have broadened the scope to include outpatients and specific populations such as immunocompromised patients.

	==See also==		==See also==
	* [[Infectious disease]]		* [[Infectious disease]]
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	* [[Cancer]]		* [[Cancer]]
	* [[Diagnostic medicine]]		* [[Diagnostic medicine]]

	==References==		==References==
	<references/>		<references/>

	[[Category:Medical terminology]]		[[Category:Medical terminology]]
	[[Category:Symptoms and signs]]		[[Category:Symptoms and signs]]
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	[[Category:Autoimmune diseases]]		[[Category:Autoimmune diseases]]
	[[Category:Oncology]]		[[Category:Oncology]]

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Prab at 17:07, 22 March 2025

2025-03-22T17:07:29Z

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2025-03-17T12:46:53Z

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2024-03-22T10:22:45Z

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'''Fever of Unknown Origin''' (FUO) refers to a condition in which a patient has an elevated temperature (fever) exceeding 38.3°C (101°F) on several occasions over a period of more than three weeks, without an established diagnosis after initial investigation. The concept of FUO was first defined in 1961, aiming to categorize patients who presented a diagnostic challenge to clinicians. Over the years, the criteria have been refined, but the essence remains the exploration of a persistent fever without a clear cause.

==Etiology==
The causes of FUO can be broadly classified into four main categories: [[Infection|infectious diseases]], [[Neoplasm|neoplasms]], [[Autoimmune diseases|autoimmune disorders]], and miscellaneous causes. Infections account for approximately 25-40% of FUO cases and can include entities like [[Tuberculosis]], [[Endocarditis]], and various viral, bacterial, and fungal infections. Neoplasms, or cancers, are responsible for about 20-30% of cases, with [[Lymphoma]] being a common culprit. Autoimmune diseases, such as [[Rheumatoid arthritis]] and [[Systemic lupus erythematosus]], account for another 10-20% of cases. The miscellaneous category includes a wide range of conditions, from [[Thromboembolic disease]] to [[Factitious disorder|factitious fever]].

==Diagnosis==
The diagnostic approach to FUO is systematic and often requires a multidisciplinary team. Initial evaluation includes a detailed patient history, physical examination, and basic laboratory tests. Further investigations are guided by clinical suspicion and may involve advanced imaging techniques like [[Computed tomography|CT scans]] or [[Magnetic resonance imaging|MRI]], and specialized laboratory tests. In some cases, invasive procedures such as biopsy may be necessary to obtain a definitive diagnosis.

==Management==
Management of FUO is directed by the underlying cause, once identified. In cases where a specific diagnosis is made, treatment is tailored to the specific condition. For infectious causes, appropriate [[Antibiotic|antibiotics]] or antiviral medications are prescribed. Neoplasms may require surgery, chemotherapy, or radiation therapy. Autoimmune disorders are often managed with immunosuppressive medications. In a significant number of cases, however, the cause of the fever remains elusive even after extensive investigation, leading to a therapeutic challenge.

==Prognosis==
The prognosis of FUO varies widely depending on the underlying cause. Infections and autoimmune conditions, when identified and treated appropriately, often have a favorable outcome. Neoplastic causes of FUO may have a more guarded prognosis, depending on the type and stage of cancer. In cases where no cause is identified, the approach is often conservative, with symptomatic treatment and close monitoring.

==Epidemiology==
The incidence of FUO varies globally, influenced by factors such as geographic location, prevalence of certain infectious diseases, and access to healthcare. Advances in diagnostic techniques have led to a decrease in the proportion of cases that remain undiagnosed, but FUO continues to represent a significant clinical challenge.

==History==
The term "Fever of Unknown Origin" was coined by Dr. Petersdorf and Beeson in 1961, setting the initial criteria for the condition. Since then, the definition has evolved, reflecting advances in medical diagnostics. The original criteria focused on hospital inpatients, but subsequent revisions have broadened the scope to include outpatients and specific populations such as immunocompromised patients.

==See also==
* [[Infectious disease]]
* [[Autoimmune disease]]
* [[Cancer]]
* [[Diagnostic medicine]]

==References==
<references/>

[[Category:Medical terminology]]
[[Category:Symptoms and signs]]
[[Category:Infectious diseases]]
[[Category:Autoimmune diseases]]
[[Category:Oncology]]

{{Medicine-stub}}