Mental health of people with cancer and beyond in its different types and stages is an important and growing research and clinical priority. Compared to the general population, the prevalence of anxiety and depression is often higher among people with cancer, but estimates vary due to a number of factors such as the type and stage of the cancer. Patients often do not have psychological support or treatment. This is likely due to several factors, including lack of awareness and recognition of psychiatric symptoms, lack of support available or provided, lack of evidence about effective treatments, stigma, and patient preference. In particular, we highlight the lack of high-quality research on the mental health of long-term cancer survivors, the potential impact of long-term and late effects of cancer treatment, and the paucity of studies on prevention. More research is needed that includes less common types of cancer, as well as younger people and populations from low- and middle-income countries. To date, most research has focused on breast cancer survivors. Population-level research documenting the occurrence and co-occurrence of mental health concerns among survivors of all cancers is scarce. In the meantime, due to the increase in the number of people living with breast cancer, the purpose of this study is to investigate the effects of cancer, especially breast cancer, on the psychological indicators of patients and their relationship based on the results of the research. How has it been in the last 15 years?