Breast cancer is the most common malignant disease in women, but the occurrence of this malignant disease in men is not unknown. Treatment is approached with a variety of aspects that include drug administration, hormone therapy, radiation, chemotherapy, and surgical treatment. The prognosis of the disease and the choice of treatment depends on the age, physical condition, menopausal status of the patient and general health. The aim of the study was to determine the degree of quality in patients with breast cancer at the Clinic of Surgery, Department of General and Oncological Surgery Rijeka and Chest Clinic after obtaining confirmation from the Ethics Committee. The survey was conducted with an anonymous survey questionnaire designed for the purpose of this research. The questionnaire was divided into socio-demographic questions and statements by which respondents were asked to assess how much impact they have on their lives and quality of life. The results showed that the highest age of the respondents is in groups over 50, most of them are married and have a high school diploma. As an impact on the quality of life of patients with breast cancer has been shown to be a sleep disorder, a perception of one's own body perception that includes fear of therapeutic procedures that result in breast and hair loss. Most respondents have a high level of subjective feelings of depression, anxiety, and anxiety. As a conclusion of this research, claims can be made that breast cancer has an impact on the quality of life of patients.