Breast cancer is cancer which develops from breast tissue. Signs of breast cancer include lump in the breast, dimpling of the skin, a change in breast shape, a red scaly patch of skin or fluid coming from the nipple. There may be symptoms like bone pain, swollen lymph nodes, shortness of breath, or yellow skin. More than 80% of breast cancer cases are diagnosed when the woman feels a lump. Mammogram is main method for detecting breast cancer. The treatment of breast cancer depends on various factors like the age of the patient and stage of cancer.