What is Breast Cancer? Breast cancer is a disease in which malignant cells in the breast tissue grow uncontrollably, often forming a tumor that can be felt as a lump or seen on an X-ray. It most commonly begins in the milk-producing ducts (ductal carcinoma) or the glandular tissue called lobules (lobular carcinoma). Key Fact: While it is the second most common cancer diagnosed in women, death rates have been steadily declining for decades due to earlier detection through screening and significant advancements in targeted, personalized therapies. It can also occur in men, though it represents less than 1% of all cases. Signs & Symptoms Routine screening via mammograms can often detect breast cancer long before any physical symptoms appear. However, you should monitor for the following changes: A New Lump or Thickening: A hard knot or "stuck" thickening inside the breast or underarm area that feels distinct...