What is TNF Receptor Associated Periodic Syndrome

TNF Receptor Associated Periodic Syndrome (TRAPS) is a rare, lifelong autoinflammatory disorder characterized by recurrent, long-lasting episodes of fever, abdominal pain, skin rashes, and joint inflammation. Unlike many other periodic fever syndromes, these flare-ups can persist for several weeks and are caused by a genetic mutation that leads to persistent activation of the body's inflammatory response.

What causes TNF Receptor Associated Periodic Syndrome?

TNF Receptor Associated Periodic Syndrome is caused by mutations in the TNFRSF1A gene. This gene provides instructions for making a protein that helps regulate the body’s inflammatory response. When this protein is dysfunctional, the body’s "off switch" for inflammation fails, leading to spontaneous, uncontrolled inflammatory episodes. TNF Receptor Associated Periodic Syndrome is inherited in an autosomal dominant pattern, meaning a child only needs to inherit the altered gene from one parent to be affected.

How does TNF Receptor Associated Periodic Syndrome affect the body?

The inflammation associated with TNF Receptor Associated Periodic Syndrome is systemic, meaning it can impact multiple organ systems simultaneously. Common clinical features include:

• Prolonged fevers: Episodes typically lasting 1 to 3 weeks.


• Dermatological issues: Migratory, painful skin rashes often accompanied by muscle pain.


• Gastrointestinal distress: Severe abdominal pain, nausea, and vomiting.


• Ocular and joint pain: Conjunctivitis, periorbital edema (swelling around the eyes), and arthritis.


• Amyloidosis: A serious, long-term complication where protein deposits damage organs like the kidneys.

How common is TNF Receptor Associated Periodic Syndrome?

TNF Receptor Associated Periodic Syndrome is an exceptionally rare condition. While the exact global prevalence is unknown due to underdiagnosis, it is estimated to affect fewer than 1 in 1,000,000 people. It affects both males and females equally and can present at any age, though it most frequently appears during childhood. At DiseaseMaps.org, we currently support a small but growing community of individuals navigating life with this complex diagnosis.

What differentiates this from other autoinflammatory diseases?

Unlike Familial Mediterranean Fever (FMF), where fevers usually last only 1–3 days, TNF Receptor Associated Periodic Syndrome is defined by its significantly longer duration of symptoms. Furthermore, the localized, migratory muscle pain and periorbital edema are distinct clinical hallmarks that help clinicians differentiate TNF Receptor Associated Periodic Syndrome from other periodic fever syndromes.

Next steps

• Consult a rheumatologist or an immunologist specializing in autoinflammatory diseases.


• Discuss genetic testing (TNFRSF1A sequencing) to confirm the clinical diagnosis.


• Connect with others through the DiseaseMaps.org community to share experiences and coping strategies.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): TNF Receptor-Associated Periodic Syndrome


• Orphanet: TNF receptor-associated periodic syndrome


• OMIM (Online Mendelian Inheritance in Man): TNFRSF1A-associated periodic syndrome


• The Autoinflammatory Alliance: Patient resources for TRAPS