Polyarteritis nodosa (PAN) is a blood vessel disease. Medium sized arteries become inflamed. Sometimes, smaller arteries are involved. This leads to problems with the organs. Without treatment, the condition can lead to death.
The cause of PAN is unknown. The immune system attacks healthy arteries. This causes inflammation. It is not known what causes the immune system to be overactive.
PAN is more common in people aged 50 to 70 years of old. However, it can happen at any age.
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