Behçet's disease (BD) is a systemic vasculitis affecting both small and large blood vessels in the venous and arterial systems. It is a multiorgan disease with various manifestations, including mucocutaneous, articular, ocular, gastrointestinal, vascular, and neurological involvements. The aim of present study is to assess pan immune inflammation value (PIN) value in BD in comparison to healthy control ,assess the PIN value in association with demographics and clinical characteristics of Behcet patients and to assess the PIN value in association with disease activity.