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Familial Mediterranean Fever (FMF) – Causes and Treatment

Familial Mediterranean Fever (FMF) is a rare, hereditary autoinflammatory disease characterized by recurrent episodes of fever and pain, primarily affecting people of Mediterranean and Middle Eastern descent.

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Things worth knowing about "Familial Mediterranean Fever"

Familial Mediterranean Fever (FMF) is a rare, hereditary autoinflammatory disease characterized by recurrent episodes of fever and pain, primarily affecting people of Mediterranean and Middle Eastern descent.

What is Familial Mediterranean Fever?

Familial Mediterranean Fever (FMF) is a rare, genetically inherited autoinflammatory disorder characterized by recurrent, self-limiting episodes of fever and inflammation of serous membranes, including the peritoneum, pleura, and joint linings. The condition predominantly affects individuals with ancestry from the Mediterranean region, the Middle East, and Central Asia, particularly Turks, Armenians, Arabs, and Sephardic Jews.

Causes and Genetics

FMF is caused by mutations in the MEFV gene (Mediterranean Fever Gene) located on chromosome 16. This gene encodes the protein pyrin, which plays a critical role in regulating inflammatory responses. In individuals with FMF, a dysfunctional pyrin protein leads to uncontrolled activation of the inflammasome -- a protein complex that triggers inflammatory reactions. The condition is most commonly inherited in an autosomal recessive pattern, meaning a child must inherit one mutated copy of the gene from each parent to develop the disease.

Symptoms

Symptoms occur in distinct episodes that typically last 12 to 72 hours and resolve spontaneously. Between episodes, most patients are entirely symptom-free.

Fever: Sudden onset of high fever (38–40 °C / 100–104 °F) is the hallmark symptom.
Abdominal pain: Often caused by peritoneal inflammation (peritonitis), which can mimic appendicitis.
Chest pain: Caused by inflammation of the pleura (pleuritis).
Joint pain: Arthritis, most commonly affecting large joints such as the knees and ankles.
Skin rash: A characteristic erysipelas-like erythema, typically appearing on the lower legs.
Scrotal pain: In male patients, inflammation of the tunica vaginalis may occasionally occur.

A serious long-term complication is amyloidosis, in which amyloid A protein accumulates in organs -- particularly the kidneys -- potentially leading to kidney failure.

Diagnosis

The diagnosis of FMF is based on clinical criteria and the exclusion of other conditions. Key diagnostic tools include:

Medical history and clinical examination: Typical attack patterns and ethnic background are important indicators.
Laboratory tests: During an episode, elevated inflammatory markers such as CRP (C-reactive protein), ESR (erythrocyte sedimentation rate), and serum amyloid A are typically found.
Genetic testing: Detection of mutations in the MEFV gene supports the diagnosis, though not all pathogenic variants have been identified.
Diagnostic criteria: Clinical classification systems such as the Tel Hashomer criteria are widely used.

Treatment

There is currently no cure for FMF, but the disease can usually be well controlled with appropriate therapy.

Colchicine

Colchicine is the first-line treatment for FMF. Taken daily, it significantly reduces both the frequency and severity of episodes. Importantly, it also prevents the development of the dangerous complication of amyloidosis. Most patients respond well to colchicine and take it on a lifelong basis.

Biologics for Colchicine-Resistant Cases

For patients who do not respond adequately to colchicine or cannot tolerate it, biological therapies are available:

IL-1 inhibitors: Anakinra (short-acting) or canakinumab (long-acting) block the inflammatory mediator interleukin-1 and are effective in treatment-resistant cases.
IL-6 inhibitors: Agents such as tocilizumab may be considered in select cases.

Additional Measures

Pain relief with non-steroidal anti-inflammatory drugs (NSAIDs) can help manage symptoms during an acute episode. Regular monitoring, especially of kidney function, is essential to detect amyloidosis at an early stage.

References

Infevers: The Registry of Hereditary Auto-inflammatory Disorders Mutations. MEFV Gene and Familial Mediterranean Fever. Available at: https://infevers.umai-montpellier.fr
Livneh A. et al. - Criteria for the diagnosis of familial Mediterranean fever. Arthritis & Rheumatism, 1997;40(10):1879–1885.
Ozen S. et al. - EULAR recommendations for the management of familial Mediterranean fever. Annals of the Rheumatic Diseases, 2016;75(4):644–651.

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