Vasculitis is an important group of diseases that must be considered as a noninfectious cause of fever of unknown origin. Polyarteritis nodosa which is one of the vasculitis syndromes is a necrotizing vasculitis which involves whole three layers of the small and medium sized arteries and it has a wide spectrum from progresive and fulminant disease to a limited disease. Because of this, we aimed to share a fever of unknown origin case and via this case poliarteritis nodosa was disscussed