Polyarteritis nodosa, also known as PAN, is a rare autoimmune disease that causes inflammation in the blood vessels. Although there are no exact synonyms for this medical term, there are other names or variations used to describe this condition. Some of these include nodular polyarteritis, Kussmaul disease, and periarteritis nodosa. Other related conditions are also associated with this disease, such as Kawasaki disease, which affects mainly children, and Takayasu arteritis, which affects the large arteries of the body. If left untreated, PAN can lead to serious complications, such as organ damage and life-threatening bleeding. Therefore, early diagnosis and appropriate treatment are important for managing this condition.