This document contains notes on breast disease taken during the author's second year studies. It lists risk factors for breast cancer like gender, age, family history and reproductive factors. It discusses signs and methods of diagnosis including physical exams, imaging and biopsies. It also summarizes different treatment options for breast cancer which include surgery, radiation, chemotherapy, hormonal and biological therapies. The notes also cover topics like breast conservation therapy, prognostic factors, hyperprolactinemia and staging of breast cancer.