Vasculitis: How Doctors Identify Which Blood Vessels Are Inflamed and What Type You Have

Vasculitis is a group of disorders characterized by inflammation of blood vessel walls. When vessels become inflamed, blood flow can be restricted or blocked, leading to tissue damage. Early recognition of vasculitis symptoms and types is key to getting the right treatment.

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Why Vessel Size Matters

Doctors classify vasculitis primarily by the size of affected vessels:

• Large‐vessel vasculitis
  – Affects major arteries (e.g., aorta, carotids)
  – Examples: Giant cell arteritis, Takayasu arteritis
• Medium‐vessel vasculitis
  – Targets mid‐sized arteries (e.g., renal, mesenteric arteries)
  – Examples: Polyarteritis nodosa, Kawasaki disease
• Small‐vessel vasculitis
  – Involves arterioles, capillaries, venules
  – Examples: Granulomatosis with polyangiitis, microscopic polyangiitis, cryoglobulinemia, IgA vasculitis

Identifying the vessel size helps narrow down the likely type of vasculitis and directs further testing.

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Common Vasculitis Symptoms

Symptoms vary based on which organs and vessels are involved. General warning signs include:

• Fever, fatigue, weight loss
• Muscle and joint aches
• Unintended bruising or purpura (tiny red or purple spots)
• Numbness, tingling, or weakness in limbs
• Headache, scalp tenderness (large‐vessel involvement)
• Abdominal pain, nausea (medium‐vessel involvement)
• Shortness of breath, coughing up blood (lung capillaries)
• Kidney problems such as blood in urine

If you experience a combination of these symptoms—or if they persist or worsen—talking to a healthcare professional is essential. Before your appointment, you can use Ubie's free AI-powered Vasculitis (including Cryoglobulinemia) Symptom Checker to better understand your symptoms and prepare questions for your doctor.

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Key Types of Vasculitis

Because treatments differ, doctors need to pinpoint the specific form. Below is an overview of some main vasculitis types:

1. Giant Cell Arteritis (Large Vessel)

   • Often in adults over 50
   • Severe headaches, jaw pain when chewing, visual disturbances

2. Takayasu Arteritis (Large Vessel)

   • Mostly affects young women
   • Dizziness, limb claudication (pain when moving arms/legs), weak pulses

3. Polyarteritis Nodosa (Medium Vessel)

   • Fever, weight loss, skin nodules
   • Abdominal pain, kidney damage without glomerulonephritis

4. Kawasaki Disease (Medium Vessel)

   • Primarily in children under 5
   • High fever, rash, swollen hands/feet, red eyes, cracked lips

5. Granulomatosis with Polyangiitis (Small Vessel)

   • Sinus infections, nasal ulcers, lung nodules
   • Kidney inflammation

6. Microscopic Polyangiitis (Small Vessel)

   • Rapidly progressive glomerulonephritis
   • Lung hemorrhage, skin purpura

7. Eosinophilic Granulomatosis with Polyangiitis (EGPA)

   • Asthma, high eosinophil counts
   • Nerve damage, skin rashes

8. Cryoglobulinemia (Small Vessel)

   • Cold‐induced purpura, joint pain, neuropathy
   • Often linked to hepatitis C or autoimmune disorders

9. IgA Vasculitis (Henoch-Schönlein Purpura, Small Vessel)

   • Palpable purpura on buttocks/legs
   • Joint pain, abdominal cramping, kidney involvement

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How Doctors Identify Inflamed Vessels

1. Clinical Evaluation

   • Detailed history of symptoms (onset, duration, triggers)
   • Physical exam for skin changes, pulses, nerve function

2. Blood Tests

   • Inflammatory markers: ESR (erythrocyte sedimentation rate), CRP (C-reactive protein)
   • Autoantibodies:
     • ANCA (anti‐neutrophil cytoplasmic antibodies) – PR3-ANCA suggests granulomatosis with polyangiitis; MPO-ANCA often in microscopic polyangiitis and EGPA
     • ANA (antinuclear antibody) for lupus overlap
     • Cryoglobulin levels if cold‐induced symptoms

3. Urinalysis

   • Detects blood or protein in urine—signs of kidney vessel involvement

4. Imaging Studies

   • Ultrasound (e.g., temporal artery in suspected giant cell arteritis)
   • Magnetic Resonance Angiography (MRA) or CT Angiography (CTA) to view vessel narrowing, aneurysms
   • Positron Emission Tomography (PET) scans to pinpoint active inflammation in large vessels

5. Tissue Biopsy

   • The gold standard for many vasculitis types
   • Small skin, nerve, or kidney sample examined under microscope
   • Confirms vessel wall inflammation and type (e.g., granulomas in giant cell arteritis)

6. Organ‐Specific Tests

   • Electrocardiogram (EKG) or echocardiogram if heart vessels may be affected
   • Pulmonary function tests and chest CT for lung involvement

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What to Expect During the Diagnostic Process

• Multiple appointments: You may see a primary care physician, rheumatologist, nephrologist or dermatologist
• Sequential testing: Initial blood work and imaging guide whether biopsy is needed
• Possible delays: Rare diseases like vasculitis sometimes take time to confirm
• Collaborative care: Teams often include specialists in rheumatology, nephrology, neurology and dermatology

While waiting for results can be stressful, remember that many forms of vasculitis respond well to treatment once the specific type is identified.

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Treatment Overview

Although treatments vary by type and severity, common approaches include:

• Corticosteroids (e.g., prednisone) to rapidly reduce inflammation
• Immunosuppressive drugs (e.g., methotrexate, azathioprine, cyclophosphamide) for maintenance
• Biologic therapies (e.g., rituximab) in certain ANCA-associated vasculitis
• Plasmapheresis or plasma exchange in severe cases (e.g., rapidly progressive kidney failure)

Early diagnosis often means shorter treatment courses and fewer complications.

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When to Seek Help

• New or worsening neurological deficits (numbness, weakness)
• Sudden vision changes or loss
• Severe chest pain, difficulty breathing
• Sharp abdominal pain with nausea/vomiting
• Signs of infection (fever, chills) while on immunosuppressive therapy

If you develop any life-threatening symptoms or suspect a vasculitis flare, speak to a doctor immediately.

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Take the Next Step

If you're concerned about unexplained symptoms—especially a combination of pain, rash, fever and nerve problems—take three minutes to complete a free Vasculitis (including Cryoglobulinemia) symptom assessment powered by AI technology that can help you understand what might be causing your symptoms and when to seek medical care.

Always remember that only a trained medical professional can diagnose vasculitis and recommend treatment. If you have worrisome or persistent symptoms, please speak to a doctor as soon as possible.