Survivors of breast cancer face a significantly elevated risk of developing second cancers, including endometrial and ovarian cancer for women and prostate cancer for men. This risk is further amplified for individuals living in areas of greater socioeconomic deprivation. Moreover, the age at which breast cancer is diagnosed and socioeconomic status may influence the risk of developing a second cancer. This research highlights the importance of considering these factors in patient care and exploring strategies to mitigate this risk.