Introduction: The popularity of complementary and alternative medicine (CAM) is increasing among cancer patients worldwide. 45% of women diagnosed with breast cancer use CAM, 62.5% of younger patients do so. So far, only one study has been published in Hungary, according to which 84.4% of Hungarian women with breast cancer use some form of complementary medicine. The utilization of some CAM modalities carries risks due to drug interactions. It is important to get to know the needs and habits of Hungarian patients in relation to CAM, which knowledge can be directly used in clinical practice. Objective: The aim of our study was to assess the extent of CAM utilization among Hungarian breast cancer patients, to examine the reasons behind this choice, and to see the relating/connecting demographic, psychological and clinical factors. Method: In a cross-sectional survey, a self-administered questionnaire was used among inpatients at the Department of Breast and Soft Tissue Surgery in the National Institute of Oncology (n = 146). We assessed socio-demographic data, characteristics of CAM use, attitudes toward CAM, and the need for health control. Clinical data were added to the questionnaire data. Results: 36% of the respondents visited some CAM providers, 71% used CAM preparation and 64% utilized self-help practices. Most patients are informed about these by a healthcare professional. The holistic approach is dominant in the sample as well as internal and social external control. Visitors to CAM providers and CAM preparation users have a stronger need for internal control. Visitors to CAM providers and self-help practitioners judge their own health status more favorable. Conclusion: The information that patients receive from people who are important to them, especially the caregiver, is crucial in their health-related behavior, including the choice of CAM. It is important to see such a high level of patient trust in health professionals and a strong need to discuss information about CAM, as well as a sense of responsibility for their health and active participation in treatment. Orv Hetil. 2022; 163(9): 350–361.