Lymphedema

Your lymphatic system is a network of vessels and nodes that carries fluid (lymph) from body tissues back into the bloodstream, playing a key role in immune function. When lymph nodes are removed or damaged — as may happen during breast cancer surgery or radiation — the drainage pathway is disrupted. Lymph fluid can accumulate in the surrounding tissue, causing swelling, heaviness, tightness, and sometimes discomfort. This is lymphedema.

In the context of breast cancer, lymphedema most commonly affects the arm on the side where lymph nodes were removed or irradiated. The extent of lymph node surgery influences risk: removing just the sentinel lymph node (the first node to which cancer cells might travel) carries a lower risk of lymphedema than a full axillary lymph node dissection, in which many nodes are removed. Radiation to the underarm area can also damage lymphatic vessels and contribute to lymphedema risk, sometimes years after treatment.

Symptoms of lymphedema include swelling that may fluctuate, a feeling of fullness or heaviness in the affected limb, tightness in the skin, aching, and reduced range of motion. The condition is classified in stages based on severity. While lymphedema cannot currently be cured, it can be very effectively managed — and if caught early, some cases can be reversed or prevented from progressing. Treatment includes specialized massage techniques (manual lymphatic drainage), compression garments, exercise, meticulous skin care, and in some cases complex decongestive therapy led by a certified lymphedema therapist.

Lymphedema is one of the most impactful long-term side effects of breast cancer treatment, and yet many women are not given enough information about it before or after surgery. Knowing your risk, recognizing the early signs, and seeking evaluation promptly if you notice swelling in your arm, hand, or chest — especially on the treated side — can make a meaningful difference in outcomes. Early-stage lymphedema is much easier to manage than advanced lymphedema.

There are also evidence-based steps you can take to reduce your risk and protect the affected arm: avoid blood pressure cuffs, needle sticks, and tight constriction on that arm when possible; protect the skin from cuts and infection; exercise regularly (contrary to old advice, moderate exercise is beneficial); and maintain a healthy weight. Connecting with a certified lymphedema therapist — ideally before you develop symptoms, or as soon as you notice any — gives you both a personalized management plan and a knowledgeable partner in your recovery.