POLITSITEMIYa (az poli… va yunoni kytos— gunjoish; dar in jo ba ma- ioi hujayra, haima— khun), bemorii muzmini sistemahoi khunofarro guyand. Ziyod shudani miqdori gemoglobin va eritrotsitho dar khun (dar natijai ikhtiloli paydoishi eritrotsitho), jigari shudani rangu rui bemor va gayra nishonahoi asosii Politsitemiya meboshand. Khunravi va trombozi ragho bodi Politsitemiya meboshand.