Which are the causes of Marshall syndrome - PFAPA?

TL;DR: Marshall syndrome, more commonly known as PFAPA syndrome (Periodic Fever, Aphthous Stomatitis, Pharyngitis, and Adenitis), is a condition with a currently unknown exact cause. While it is classified as an autoinflammatory disorder, it is not considered an inherited genetic disease, and researchers believe the symptoms are triggered by a dysregulated innate immune response.

What exactly is the cause of PFAPA syndrome?

The precise etiology of Marshall syndrome (PFAPA) remains a subject of ongoing medical research. Unlike many rare diseases that are caused by a single, identifiable mutation in a gene, PFAPA syndrome appears to be an autoinflammatory condition. This means that the body’s innate immune system—the "first responder" that fights off infections—becomes overactive without a clear external trigger, such as a virus or bacteria. In patients with Marshall syndrome (PFAPA), the immune system seems to "misfire," causing periodic episodes of inflammation in the throat, mouth, and lymph nodes.

Is there a genetic component to Marshall syndrome?

Current clinical consensus indicates that Marshall syndrome (PFAPA) is not a classic hereditary disease. Geneticists have not identified a single "PFAPA gene" responsible for the condition. While some studies have explored potential genetic predispositions or associations with specific immune-related genes, there is no evidence to suggest that the syndrome follows a typical Mendelian inheritance pattern (such as dominant or recessive inheritance). Most cases of Marshall syndrome (PFAPA) occur sporadically, meaning there is usually no family history of the condition.

What are the suspected triggers and mechanisms?

Researchers are investigating several theories regarding why Marshall syndrome (PFAPA) manifests in children, typically before the age of five. Because the symptoms are cyclical and include fever and inflammation, several mechanisms are being studied:

• Innate Immune Dysregulation: An abnormal surge in proinflammatory cytokines (signaling proteins like IL-1β) during fever episodes.


• Microbiome Interactions: Some researchers hypothesize that the oral microbiome may play a role in triggering the inflammatory response in the throat and mouth.


• Infectious Triggers: While not caused by a chronic infection, some experts suggest that a common viral or bacterial encounter might "prime" the immune system of a susceptible child to react disproportionately.

What is the difference between causes and risk factors?

In medical research, the "cause" refers to the fundamental biological reason a disease exists, while "risk factors" are conditions that might make someone more likely to develop it. For Marshall syndrome (PFAPA), the cause is the underlying, yet unidentified, immune dysregulation. Known factors that categorize a patient include the age of onset (usually under 5 years old) and the specific, predictable periodicity of the fever cycles. Unlike many other illnesses, there are no known environmental exposures, diets, or lifestyle factors that have been proven to cause the development of PFAPA syndrome.

What does current research tell us?

The medical community is actively working to better define the biological markers of Marshall syndrome (PFAPA). Recent studies are focusing on the role of the inflammasome—a complex of proteins that triggers inflammation—to see if subtle variations in these pathways explain why some children develop the syndrome and others do not. At DiseaseMaps.org, our community of 7 members helps us track how these symptoms present across different populations, which remains vital for researchers gathering data on this rare clinical presentation.

Next steps

• Consult a pediatric rheumatologist or an immunologist to confirm the diagnosis and rule out other periodic fever syndromes.


• Maintain a detailed fever diary to track the frequency and duration of episodes, which is essential for clinical evaluation.


• Join a patient support group or the Marshall syndrome (PFAPA) community at DiseaseMaps.org to share experiences and stay updated on the latest research.

Medical disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of a qualified healthcare provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): PFAPA Syndrome.


• Orphanet: Periodic fever, aphthous stomatitis, pharyngitis, cervical adenitis syndrome.


• OMIM (Online Mendelian Inheritance in Man): PFAPA Syndrome entry.


• PubMed/NCBI: Recent literature reviews on the pathophysiology of periodic fever syndromes.