Breast Cancer Breast cancer is the most common cancer among women. There are many types of breast cancer that differ in their capability of spreading (metastasize) to other body tissues. The causes of breast cancer are not yet fully known, although a number of risk factors have been identified. There are many different types of breast cancer. Breast cancer symptoms and signs include a lump in the breast or armpit, o bloody nipple discharge, inverted nipple, orange-peel texture or dimpling of the breast's skin, breast pain or sore nipple, swollen lymph nodes in the neck or armpit, and a change in the size or shape of the breast or nipple. Breast cancer is diagnosed during a physical exam, by a self-exam of the breasts, mammography, ultrasound testing, and biopsy. Treatment of breast cancer depends on the type of cancer and its stage (0-IV) and may involve surgery, radiation, or chemotherapy. There are many risk factors that increase