Ma'anar ƙamus na kalmar "cututtukan cuta" cuta ce da ke yaɗuwa daga mutum zuwa wani ta hanyoyi daban-daban, kamar saduwa ta jiki, iska, ruwa, ko abinci. Hakanan ana kiran waɗannan cututtuka da cututtuka masu yaduwa ko masu yaduwa, kuma suna iya haifar da su ta hanyar ƙwayoyin cuta daban-daban, ciki har da ƙwayoyin cuta, ƙwayoyin cuta, fungi, da parasites. Wasu misalan cututtuka masu yaɗuwa sun haɗa da mura, mura, tarin fuka, kyanda, da cututtukan da ake ɗauka ta hanyar jima'i kamar HIV/AIDS.