Turista shine sakamakon kamuwa da kwayoyin cuta, na abin sha ko na abincin da mutum ya ci. Abubuwan da suka fi kamuwa da cutar sune kwayoyin cuta (Escherichia coli, shigella, salmonella, Campylobacter), wani lokacin ƙwayoyin cuta (rotavirus) ko parasites (amoeba). Rashin isasshen tsafta (musamman amfani da ruwan da ba a sha ba) yana fifita wannan watsawa. Kasashen da abin ya shafa akai-akai sun hada da Masar, Indiya, Thailand, Pakistan, Morocco, Kenya, Tunisia, Caribbean, Turkey, Mexico, da dai sauransu. Kuma a Turai, Malta, Girka, Spain da Portugal suma suna kan asalin wasu lokuta, amma a cikin mafi karami rabbai.