3. Swelling

In the early stages of this form of cancer, the breast may look completely normal, even though it has cancerous cells, which is why early detection of breast cancer is so very important for the success of its treatment. As cancer progresses, the breast may begin to swell. The arm on the same side of the body may also be affected by swelling, along with under the arm and the area of the armpit. When the lymph nodes that are located under the arm are cancerous, they begin to swell up, blocking fluids and altering the way that they flow throughout the body, causing the swelling in many different areas.
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