Ciwon Caisson, wanda kuma aka sani da rashin lafiya ko lanƙwasawa, wani yanayi ne da ke faruwa a lokacin da mutum ya sami raguwar matsa lamba, kamar lokacin hawa daga nutsewa mai zurfi, hawa cikin jirgin sama ko fitowa daga caisson (wani yanayi). dakin da ba shi da iska da ake amfani da shi wajen ginin karkashin ruwa). Canjin matsi na ba zato ba tsammani yana haifar da kumfa na nitrogen a cikin jini da kyallen takarda, wanda ke haifar da nau'ikan alamomin da suka haɗa da ciwon haɗin gwiwa, gajiya, juwa, ƙarancin numfashi, har ma da alamun cututtukan jijiya a lokuta masu tsanani.