Breast cancer is the cancer, which develops in breast tissue. Breast cancers can be of 18 different forms, including ductal carcinoma and lobular carcinoma. The treatment of breast cancer depends on the person's age and the stage of the cancer. It may be approached aggressively if the prognosis is poor or if there is a high chance of recurrence following the treatment. Surgery, chemotherapy and radiotherapy are some treatment options. Surgery involves the physical removal of the tumor. This can be done through a mastectomy, lumpectomy or quadrantectomy. After surgery, breast cancer treatment may include chemotherapy, hormone-blocking therapy and monoclonal antibodies. Radiation therapy may be delivered to a cancer patient in the form of brachytherapy or as external beam therapy. This book aims to elucidate the causes, diagnosis and treatment of breast cancer. It unravels the recent studies in this medical condition. It is an essential guide for clinicians, doctors and medical students.