Polyarteritis Nodosa: A Comprehensive Guide

Primary Symptoms

• Fever and fatigue - Persistent low-grade fever with unexplained tiredness that doesn't improve with rest

• Muscle and joint pain - Aching muscles and joints, especially in the legs and arms, that may worsen over time

• Skin changes - Red or purple patches, painful nodules under the skin, or areas of skin breakdown and ulcers

• Unexplained weight loss - Losing weight without trying, often accompanied by loss of appetite

• Abdominal pain - Severe stomach pain that may come and go, sometimes with nausea and vomiting

• High blood pressure - New or worsening high blood pressure due to kidney involvement

• Nerve problems - Numbness, tingling, or weakness in hands and feet from nerve damage

When to Seek Care

Contact your healthcare provider if you experience persistent fever with unexplained muscle pain and fatigue. Call 911 for signs of stroke, including sudden confusion, difficulty speaking, facial drooping, or sudden arm or leg weakness. Seek immediate medical care for severe abdominal pain, chest pain, severe difficulty breathing, or a sudden severe headache.

When to Seek Immediate Care

Call 911 if you experience chest pain, severe difficulty breathing, sudden severe headache, or signs of stroke including facial drooping, arm weakness, or speech difficulties.

Medical History & Physical Examination

Your doctor will ask about your symptoms, when they started, and how they've changed over time. They'll want to know about any recent infections, medications you've taken, and your family history of autoimmune diseases. During the physical exam, they'll check your blood pressure, listen to your heart and lungs, examine your skin for rashes or nodules, and test your reflexes and muscle strength.

The physical examination may reveal enlarged lymph nodes, abdominal tenderness, or changes in your pulse strength in different parts of your body. Your doctor will also look for signs of organ damage that might suggest blood vessel inflammation affecting specific organs.

Diagnostic Testing

• Blood tests - Check for inflammation markers (ESR, CRP), kidney function, liver enzymes, and hepatitis B status

• Angiography - X-ray imaging of blood vessels using contrast dye to show areas of narrowing or aneurysms

• Tissue biopsy - Taking a sample from an affected area, often skin, muscle, or a peripheral nerve, to look for characteristic artery inflammation; the safest and most useful site depends on your symptoms.

• CT or MRI scans - Detailed imaging to check for organ damage and blood vessel abnormalities

• Electromyography (EMG) - Tests nerve and muscle function if you have symptoms of nerve damage

Conservative Treatments

• Corticosteroids - Prednisone or similar medications to quickly reduce inflammation and control acute symptoms

• Immunosuppressive drugs - Medications like methotrexate or azathioprine to prevent immune system attacks on blood vessels

• Blood pressure management - ACE inhibitors or other medications to protect your kidneys and heart from high blood pressure

• Pain management - Ask your healthcare team which pain relievers are safe for you, especially if PAN has affected your kidneys, blood pressure, stomach, or intestines.

• Physical therapy - Gentle exercises and stretches to maintain mobility and prevent muscle weakness

Advanced Treatments

• Cyclophosphamide - A powerful immune suppressant used for severe cases with organ-threatening complications

• Other immune-targeting treatments may sometimes be considered by a vasculitis specialist when standard treatment is unsuitable or ineffective, but evidence for rituximab in PAN is limited.

• Plasmapheresis - A procedure that filters harmful antibodies from your blood in severe cases

• Surgical intervention - Rarely needed, but may be necessary to repair damaged blood vessels or treat complications

Daily Management Strategies

Take medications exactly as prescribed, even when you feel well, since stopping treatment can lead to disease flares. Keep a symptom diary to track how you're feeling and identify potential triggers for symptom worsening. Stay up to date with vaccinations, but avoid live vaccines while on immunosuppressive medications. Practice good hygiene and avoid crowds during cold and flu season since your immune system may be suppressed.

Exercise & Movement

Gentle, low-impact exercises like walking, swimming, or yoga can help maintain your strength and flexibility without putting too much stress on your joints. Avoid high-intensity activities during active disease phases, but try to stay as active as possible during periods of remission. Listen to your body and rest when you need to, but don't let fear of symptoms keep you completely sedentary.