Abstract: Behcet's Disease (BD) is classified among the Vasculitides. It is characterized by mucocutaneous and ophthalmologic manifestations and seen mostly in the Northern Hemisphere and in countries along the silk road. The characteristics of BD are presented here in a nation wide analysis of 3443 patients in Iran over a 21 year period. There was a slight male preponderance M.F ratio 1.4:1 (53.3% male/46.7% female). The mean age of onset was ...