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Why does breast cancer sometimes spread to the underarm lymph nodes?

More advanced forms of cancer can spread to other parts of the body, including the underarm lymph nodes. Some types of cancer can spread through the bloodstream; others can spread through the lymphatic system. When the cancer spreads through the lymphatic system, it will spread to the lymph nodes that serve that part of the body.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.