Ciwon daji mai launi (CRC), wanda kuma aka sani da ciwon hanji, ciwon hanji, ko kansar dubura, shine ci gaban kansa daga hanji ko dubura (sassan babban hanji). Ciwon daji shine rashin girma na sel waɗanda ke da ikon mamayewa ko yada zuwa wasu sassan jiki. Alamomi da alamomi na iya haɗawa da jini a cikin stool, canjin hanji, raguwar nauyi, da jin gajiya koyaushe. Yawancin ciwon daji na launin fata suna faruwa ne saboda tsufa da abubuwan rayuwa, tare da ƙananan adadin lokuta kawai saboda rashin lafiyar kwayoyin halitta. Sauran abubuwan haɗari sun haɗa da abinci, kiba, shan taba, da rashin motsa jiki. Abubuwan da ake ci waɗanda ke ƙara haɗarin sun haɗa da jan nama, naman da aka sarrafa, da barasa. Wani abu mai haɗari shine cututtukan hanji mai kumburi, wanda ya haɗa da cutar Crohn da ulcerative colitis. Wasu daga cikin cututtukan da aka gada waɗanda ke haifar da ciwon daji na launin fata sun haɗa da polyposis na iyali adenomatous polyposis da ciwon daji mara polyposis na hanji; duk da haka, waɗannan suna wakiltar ƙasa da 5% na lokuta.