Which condition is a form of vasculitis involving several small and medium arteries at the same time?

Polyarteritis nodosa (PAN) is a form of vasculitis that affects several small and medium-sized arteries simultaneously. It leads to inflammation of the blood vessels, which can restrict blood flow and cause damage to various organs. Symptoms may include fever, fatigue, weight loss, and muscle pain, among others. Early diagnosis and treatment are crucial to prevent serious complications.