Churg-Strauss Syndrome (Eosinophilic Granulomatosis with Polyangiitis)
A rare eosinophil-driven vasculitis linked to asthma
Quick Facts
- Type: Vasculitis (blood-vessel inflammation)
- Hallmark: Asthma with high eosinophils
- Organs affected: Lungs, nerves, skin, heart, sinuses
- Main treatment: Steroids and immune-suppressing therapy
Overview
Churg-Strauss syndrome, now usually called eosinophilic granulomatosis with polyangiitis (EGPA), is a rare disease in which inflammation of small and medium blood vessels (vasculitis) occurs together with high numbers of eosinophils, a type of white blood cell. It typically develops in people who have asthma and allergic conditions, and the inflammation can affect the lungs, sinuses, nerves, skin, heart, and digestive tract.
The condition often unfolds in phases, beginning with asthma and nasal allergy symptoms, followed by rising eosinophils that affect tissues, and then the vasculitis stage where blood-vessel inflammation can damage organs. While serious, EGPA usually responds well to treatment that suppresses the immune system, and many people achieve long-term remission. Because heart and nerve involvement can be serious, early diagnosis and treatment are important.
Symptoms
Symptoms vary depending on which organs are affected and the stage of the disease. They often build over time and can include:
- Worsening asthma and persistent wheezing
- Chronic sinus problems, nasal congestion, and nasal polyps
- Fever, fatigue, weight loss, and general malaise
- Numbness, tingling, weakness, or pain from nerve involvement
- Skin rashes, lumps, or sores
- Cough or shortness of breath
- Abdominal pain or digestive problems
- Chest pain or palpitations if the heart is affected
Heart involvement is a leading cause of serious illness. Seek emergency care for chest pain, severe shortness of breath, fainting, or stroke-like symptoms.
Causes
The exact cause of Churg-Strauss syndrome is not known, but it involves an overactive immune response in which eosinophils accumulate and blood vessels become inflamed. Contributing factors are thought to include:
- Immune system dysregulation: the immune system mistakenly attacks the body's own blood vessels.
- Allergic background: most people have a history of asthma and allergic rhinitis.
- Possible triggers: certain medications and other exposures have been suspected of triggering the condition in some people, though no single cause is established.
It is not contagious and is not directly inherited, although a tendency toward allergic disease may play a role.
Risk Factors
Churg-Strauss syndrome is rare, and its main associations include:
- A history of adult-onset or worsening asthma
- Allergic rhinitis and chronic sinus disease with nasal polyps
- Middle adulthood, as most cases appear between the 30s and 50s
- A history of high eosinophil counts
Most people who have asthma will never develop this condition; it remains uncommon.
Diagnosis
Diagnosis combines the clinical picture with blood tests, imaging, and sometimes a tissue biopsy. Evaluation may include:
- Blood tests: showing a high eosinophil count and markers of inflammation; specific antibodies (ANCA) are present in some people.
- Imaging: chest X-ray or CT to look for lung involvement, and other imaging based on symptoms.
- Nerve studies: if numbness or weakness suggests nerve damage.
- Biopsy: a sample of affected tissue, such as skin, nerve, or lung, can show eosinophils and vessel inflammation.
- Heart tests: echocardiogram and other studies to check for cardiac involvement.
Treatment
Treatment aims to calm the immune system, lower eosinophils, and protect organs, then maintain remission. Approaches include:
- Corticosteroids: the mainstay of treatment, often producing rapid improvement.
- Immune-suppressing medications: added for severe disease or major organ involvement, such as heart, nerve, or kidney problems.
- Biologic therapy: medications that target eosinophils can help reduce flares and allow lower steroid doses.
- Asthma and allergy management: ongoing control of asthma and sinus symptoms.
- Monitoring: regular follow-up and organ testing to detect relapses early.
Many people reach remission, though some have a relapsing course and need long-term treatment. Heart involvement requires close attention.
Prevention
There is no known way to prevent Churg-Strauss syndrome itself, but careful management reduces flares and complications. Helpful steps include:
- Taking medications as prescribed and not stopping them abruptly
- Attending regular follow-up and organ monitoring
- Reporting new symptoms, such as numbness, chest pain, or breathlessness, promptly
- Keeping asthma and sinus disease well controlled
- Staying up to date with vaccinations and infection precautions while on immune-suppressing treatment
When to See a Doctor
See a doctor if you have worsening asthma along with symptoms such as numbness or weakness, persistent rashes, unexplained weight loss, or sinus problems, especially if blood tests show high eosinophils. Early diagnosis helps prevent lasting organ damage.
Seek emergency care immediately for chest pain, severe shortness of breath, fainting, sudden severe weakness or numbness, or stroke-like symptoms such as facial drooping or slurred speech, as these can reflect serious heart, nerve, or vascular complications.
Frequently Asked Questions
What is Churg-Strauss syndrome?
It is a rare disease, now called eosinophilic granulomatosis with polyangiitis (EGPA), in which blood-vessel inflammation occurs along with high eosinophils. It usually affects people with asthma and can involve the lungs, nerves, skin, sinuses, and heart.
Is Churg-Strauss syndrome related to asthma?
Yes. Most people with the condition have a history of asthma and allergic sinus disease, often for years before the vasculitis stage develops. However, the vast majority of people with asthma never develop this rare condition.
Is Churg-Strauss syndrome serious?
It can be serious, especially when it affects the heart or nerves, but it usually responds well to treatment. Many people achieve remission with steroids and immune-suppressing therapy, though some have a relapsing course that needs long-term management.
How is Churg-Strauss syndrome treated?
Corticosteroids are the main treatment and often work quickly. Immune-suppressing drugs are added for severe or organ-threatening disease, and biologic medications that target eosinophils can reduce flares and lower steroid needs. Regular monitoring helps catch relapses early.
What are the warning signs of serious complications?
Chest pain, severe shortness of breath, fainting, and stroke-like symptoms suggest heart or vascular involvement and need emergency care. New numbness or weakness can indicate nerve damage and should be evaluated promptly.
References
- National Organization for Rare Disorders (NORD). Eosinophilic Granulomatosis with Polyangiitis.
- Vasculitis Foundation. Eosinophilic Granulomatosis with Polyangiitis (EGPA).
- MedlinePlus, U.S. National Library of Medicine. Vasculitis.
- National Institute of Allergy and Infectious Diseases (NIAID). Vasculitis.