AbstractBackgroundAlthough improved breast cancer (BC) treatment has decreased mortality, these anti-cancer regimens may have serious cardiovascular side effects that affect patients’ long-term prognosis and quality of life (QoL). BC patients with cancer treatment-related cardiac dysfunction (CTRCD) can suffer from a variety of symptoms, such as dyspnoea and fatigue. The impact of CTRCD after BC treatment on patients’ daily life has not been qualitatively explored yet.AimsThis study aims to explore the influence of CTRCD on QoL of women with BC, as defined by the concept of positive health. Second, we aim to evaluate the personal experience with cardiac surveillance during the BC trajectory.Methods and resultsA qualitative study with semi-structured interviews was conducted and thematically analysed to explore the QoL and healthcare experiences of BC patients with CTRCD. Twelve patients participated in this study. Five themes are selected in response to the study objective: (i) patients: overwhelming fatigue, (ii) patients: mental burden of anxiety, (iii) social setting: lack of understanding and acceptance, (iv) medical specialists: lack of knowledge and acknowledgement, and (v) patients: need for personalized care.ConclusionThis study identified core components of the impact CTRCD has on the QoL of BC patients. Patients experienced an increased health-related burden due to CTRCD, affecting their physical, social, and psychosocial well-being. Healthcare experiences were largely affected by a lack of acknowledgement and professional communication. Patients underlined the need for personalized care during follow-up.