TRAPS Symptoms, Flares, and Warning Signs

A hallmark of Tumor Necrosis Factor Receptor 1 Associated Periodic Syndrome (TRAPS) is the prolonged inflammatory flare. While many other periodic fever syndromes cause brief episodes of illness, TRAPS is known for attacks that can last for weeks, significantly impacting your daily life ^[1][2].

Recognizing the TRAPS Flare Pattern

One of the most distinguishing features of TRAPS is the duration of its symptoms. While conditions like Familial Mediterranean Fever (FMF) typically cause fevers that resolve within 1 to 3 days, a typical TRAPS flare characteristically lasts more than 7 days, often stretching between 1 and 3 weeks ^[3][2]. However, shorter or atypical attacks can occur and do not entirely rule out the diagnosis.

During these episodes, you may experience a combination of unique symptoms:

• Migratory Myalgia: This is muscle pain (myalgia) that moves or “migrates” from one part of the body to another as the flare progresses ^[4].
• Migratory Rash: A red, painful, or itchy skin rash (erythematous rash) often appearing on the skin directly above the area of muscle pain. Like the myalgia, this rash can move across different parts of your body ^[5].
• Periorbital Edema: Swelling and redness around the eyes (periorbital) is a specific sign often seen in TRAPS but rarely in other fever syndromes ^[6][4].
• Serositis: Inflammation of the linings of your internal organs (serosa). This can manifest as severe abdominal pain (inflammation of the abdominal lining) or chest pain (inflammation of the lining around the lungs or heart) ^[7][8].

What Triggers a Flare?

Flares can occur completely spontaneously. However, many patients report that certain events act as triggers for their immune system. While these are patient-reported and highly variable, they may include:

• Physical injury or minor trauma ^[4].
• Psychological stress or exhaustion.
• Infections, such as a common cold or the flu ^[1].
• Hormonal changes.

(Note: While exposure to cold is a classic trigger for a different syndrome called CAPS, it is less defining for TRAPS). Keeping a “flare diary” can help you identify your personal patterns rather than unnecessarily avoiding everyday activities.

When to Seek Urgent Care: Your Action Plan

It is vital to have a written flare and infection action plan customized by your treating team. Do not assume every fever is just a “normal” TRAPS flare, especially if you are taking medications that suppress your immune system.

For a typical flare that follows your usual pattern, contact your treating team according to your plan. However, seek emergency medical attention if you experience:

• Signs of Severe Infection on Biologics: If you are taking biologic medications (like canakinumab or anakinra), your immune system’s ability to fight germs is lowered ^[9]. Signs of a serious infection—such as extreme lethargy, confusion, a stiff neck, persistent vomiting, severe dehydration, trouble breathing, or a fever that feels different than your TRAPS fever—require urgent assessment. Do not hold or restart a biologic without specific advice from your prescriber.
• Severe or New Chest Pain: While TRAPS can cause chest pain through pleuritis (lung lining inflammation), it can also rarely cause pericarditis (heart lining inflammation) ^[8]. Because chest pain can also signal a heart attack, it must be evaluated by a professional ^[10].
• Intense, Localized Abdominal Pain: Inflammation of the abdominal lining (peritonitis) can mimic a surgical emergency like appendicitis ^[1]. If your abdominal pain feels different than usual or is concentrated in one area, seek care to rule out a surgical issue.
• Vision Changes: If you experience sudden redness, pain, or changes in your vision, it could indicate uveitis (eye inflammation), which requires prompt treatment to protect your sight ^[11].