Chemosis kalma ce ta likitanci wacce ke nufin kumburin ido, wanda shine sirara, bayyanannen kyallen da ke rufe farin bangaren ido da kuma cikin fatar ido. Wannan kumburi yawanci ana haifar da shi ta hanyar tarin ruwa a cikin conjunctiva, kuma yana iya zama alamar yanayin rashin lafiya, kamar rashin lafiyar jiki, kamuwa da cuta, ko kumburi. Hakanan ana iya haɗa chemosis da wasu cututtukan ido ko raunuka.