AimThe purpose of this study was to understand the caregiving experiences of breast cancer family caregivers and explore the profound impacts of those experiences on their quality of life.DesignA qualitative research method was used.MethodsWe extended invitations to 23 family caregivers of outpatients and inpatients receiving breast surgery and oncology treatments in Taiyuan, China, to participate in semi‐structured interviews. The interviews were audio‐recorded and transcribed verbatim. Thematic analysis was employed to analyse the interview data.ResultsFour themes and associated categories were identified: (1) changes in family dynamics, (2) the socio‐medical context, (3) interactions between family and society, (4) self‐efficacy and nine subthemes and their related categories, where virtually all participants expressed future uncertainty, emotional contagion, and personal challenges, and self‐efficacy had a moderating influence on the first three themes.Patient or Public ContributionThis study did not involve direct participation of patients or the public. However, their experiences and perspectives on caregiving were indirectly reflected through the insights provided by the family caregivers who participated in the interviews. Their valuable input contributed to a deeper understanding of the caregiving experience and its impact on the quality of life for Chinese breast cancer family caregivers.