Research Discovery: Understanding Cancer-Related Lymphedema

Cancer-related lymphedema is long-term swelling that can happen after cancer treatment. It occurs when the lymphatic system—part of the body that helps drain fluid, fight infection, and support immune health—is damaged by surgery, radiation, or cancer itself.

The swelling most often affects an arm or leg, but it can also involve the trunk, breast, head and neck, or genital area. Lymphedema is usually lifelong once it starts, but with early detection and proper care, it can often be managed and kept from getting worse.

How It Works

The lymphatic system acts like a drainage network, moving extra fluid and waste out of tissues and back into the bloodstream. Cancer treatments sometimes remove or damage lymph nodes and vessels. When this happens, fluid cannot drain properly and begins to build up.

At first, swelling may come and go. Over time, if untreated, the fluid buildup can cause inflammation, skin thickening, fat buildup, and hardening of the tissues. In later stages, the swelling becomes more permanent and can increase the risk of infections, pain, and difficulty moving the affected body part.

Key Findings

• Lymphedema is common. About 1 in 6 people treated for cancer develop some level of lymphedema, with risk varying by cancer type and treatment. Breast and gynecologic cancer survivors are especially affected.
• Earlier cancer care has reduced risk. Newer surgical approaches, like removing fewer lymph nodes when possible, have lowered lymphedema rates.
• Early detection matters. New tools can identify fluid changes before visible swelling starts, allowing earlier action and better outcomes.
• Treatment works, but management is ongoing. The main treatment—called complete decongestive therapy—combines compression, movement, skin care, and education. This does not cure lymphedema, but it can greatly reduce swelling and symptoms.
• Exercise is safe and helpful. Carefully guided strength and resistance exercise lowers the risk of developing lymphedema and helps people already living with it.
• Quality of life is affected. Lymphedema can interfere with daily activities, work, body image, and mental health, especially when care is delayed or access to treatment is limited.

Community Impact

Cancer-related lymphedema is a hidden but important survivorship issue. Many people are not warned about it, are diagnosed late, or struggle to find affordable, specialized care. This can lead to preventable complications, missed work, and emotional distress.

Community education, early screening, and referral to trained rehabilitation professionals can make a real difference. Supporting access to compression supplies, physical therapy, and culturally appropriate education helps cancer survivors stay active, independent, and engaged in their communities.

By recognizing lymphedema as a manageable long-term condition—and not just a side effect—communities can improve health equity and quality of life for people living with and beyond cancer.

Researcher: Andrea L. Cheville, M.D.

https://doi.org/10.1136/bmj-2024-081351