Swelling After Cancer Therapy May Indicate Lymphedema, Experts Warn

Persistent swelling in an arm, leg or other body part after cancer treatment can be lymphedema, a chronic condition caused by fluid buildup.

What Is Lymphedema

Lymphedema occurs when the lymphatic system, which normally drains protein‑rich fluid from tissues back into the bloodstream, is damaged or its vessels are blocked. Dr Samarth Gupta, Consultant in Senior Plastic & Breast Reconstructive Surgery at Apollo Athenaa Women’s Cancer Centre, explains that damaged or removed lymph nodes halt drainage, leading to fluid‑filled swelling, heaviness, tight skin and eventual hardening of tissue.

Causes

Cancer surgeries often remove lymph nodes to check for spread or to lower recurrence risk. Axillary node dissection for breast cancer and groin node dissection for pelvic cancers involve extensive node removal and carry the highest lymphedema risk. Radiation therapy adds scar tissue that narrows or blocks remaining vessels, raising susceptibility further, especially with higher doses or advanced cancer stages.

Warning Signs

Early signs may appear months or years after treatment. Survivors should watch for persistent heaviness, tightness, fullness or aching in a limb, hand, groin or neck. A ring, bracelet, watch or shoe suddenly feeling tighter, brief swelling, skin that retains an indent when pressed, or joint stiffness are key clues. Any change should be reported to the treating team.

Prevention & Treatment

Protecting skin from cuts and infections, maintaining a healthy weight and doing gentle exercise help lower risk. Avoid blood draws or pressure measurements on an affected limb when possible. Some centres perform preventive lymphovenous bypass during the initial cancer surgery. Once lymphedema develops, it cannot be cured, but early intervention with Complete Decongestive Therapy—manual lymphatic drainage, multilayer compression bandaging, custom garments, specialised exercises and strict skin care—can control swelling. Eligible patients may also benefit from super‑microsurgical procedures such as Lymphovenous Bypass or Vascularized Lymph Node Transfer.

Context

Lymphedema is most common among survivors of breast, pelvic, head‑and‑neck and skin cancers like melanoma. The condition reflects how cancer treatments can disrupt the body’s natural fluid‑drainage network, making ongoing monitoring essential for long‑term quality of life.