I'm a post menopause and have recently started experiencing breast tenderness after years of not having it. I used to have the tenderness really bad when I was having periods. I've been on spiro for almost a year now and it's the only drug that has lowered my blood pressure and kept my potassium level normal. After researching the internet about the tenderness, the drug keeps coming up with reference to breast cancer. Now I'm freaking out because my mother died of breast cancer and I'm thinking that maybe I shouldn't be taking this drug. I want my bp to continue to be low and potassium normal but I don't want to risk breast cancer. Whats the connection with spironolactone and breast cancer?