Regarding her voice type, Carey has said she is an alto, although several critics have described her as a coloratura soprano. Carey claims that she has had nodules on her vocal cords since childhood, due to which she can sing in a higher register than others. However, tiredness and sleep deprivation can affect her vocals due to the nodules, and Carey explained that she went through a lot of practice to maintain a balance during singing. Carey stated in a 2021 interview with the "Daily Express" that with her voice, it's all about "timing, vocal rest and sleep".