ABSTRACT Purpose To understand the benefits of cochlear implantation in adulthood under the perspective of users. Methods Qualitative study using Symbolic Interactionism and Straussian Grounded Theory as theoretical and methodological frameworks, respectively. The project was approved by the Research Ethics Committee of the aforementioned Institution (Opinion no. 482,019). Sixteen adult cochlear implant (CI) users aged 28-58 years participated in the study. The data collection instrument was a semi-structured interview with questions about changes caused by CI in the social relations, communication, family system, and personal, academic and professional spheres of life of users. Results The category Cochlear Implant Effects on Adulthood is part of a more comprehensive theoretical study that addresses how adult CI users cope with deafness. Together with its subcategories, it shows that CI intervenes in a revolutionary way in the lives of its users, because it increases their sense of security, enables them to see life from a new perspective, rescues self-confidence and self-esteem, enables them to communicate and interact more effectively, enjoy music and other entertainment, rescue old projects, and make plans for the future; thus assisting with the process of recovering independence in adult life. Conclusion Subjective impressions of the users showed that cochlear implants not only improve their auditory performance, but also bring several positive changes to their social insertion and quality of life. Therefore, this intervention is highly beneficial to deaf adults.