Polyarteritis nodosa is a serious blood vessel disease in which small and medium-sized arteries become swollen and damaged.

Polyarteritis nodosa is a disease of unknown cause that affects arteries, the blood vessels that carry oxygenated blood to organs and tissues. It occurs when certain immune cells attack the affected arteries.

The condition affects adults more frequently than children. It damages the tissues supplied by the affected arteries because they don't receive enough oxygen and nourishment without a proper blood supply.

In this disease, symptoms result from damage to affected organs, often the skin, heart, kidneys, and nervous system.

Generalized symptoms include fever, fatigue, weakness, loss of appetite, and weight loss. Muscle and joint aches are common. The skin may show rashes, swelling, ulcers, and lumps.

Nerve involvement may cause sensory changes with numbness, pain, burning, and weakness. Central nervous system involvement may cause strokes or seizures. Kidney involvement can produce varying degrees of renal failure.

Involvement of the arteries of the heart may cause a heart attack, heart failure, and inflammation of the sack around the heart (pericarditis).

• Fatigue
• Weakness
• Fever
• Abdominal pain
• Decreased appetite
• Unintentional weight loss
• Muscle aches
• Joint aches

There are no specific lab tests for diagnosing polyarteritis nodosa. Diagnosis is generally based upon the physical examination and a few laboratory studies that help to confirm the diagnosis:

• CBC may show a higher-than-normal white blood count.
• ESR is often higher than normal.
• Tissue biopsy reveals inflammation in small arteries, called arteritis.
• Immunoglobulins may be increased.