Can Radiation Therapy Cause Lymphoedema?

Radiation therapy plays a vital role in treating many types of cancer by destroying cancer cells and reducing the risk of recurrence. Like all cancer treatments, however, it may have certain long-term effects. One of the possible radiation therapy side effects is lymphoedema, a condition that causes swelling due to a build-up of lymphatic fluid.

Not everyone who undergoes radiation therapy develops lymphoedema, but understanding the risk can help with early recognition and timely treatment. This article explains how radiation therapy can contribute to lymphoedema, who is most at risk, the symptoms to watch for, and the treatment options available.

What Is Lymphoedema?

Lymphoedema is a condition that occurs when the lymphatic system is unable to drain lymph fluid effectively, leading to fluid retention and swelling in the affected part of the body. 

The lymphatic system is a network of vessels and lymph nodes that helps remove excess fluid, waste products, and supports the body's immune function. When this drainage system is damaged or blocked, lymph fluid accumulates in the surrounding tissues, resulting in persistent swelling.

Can Radiation Therapy Cause Lymphoedema?

Yes, radiation therapy can increase the risk of lymphoedema, although not everyone experiences this complication. Radiation may damage or scar nearby lymph vessels and lymph nodes, making it more difficult for lymph fluid to flow normally. Over time, scar tissue can further restrict lymphatic drainage, leading to fluid retention and swelling. 

In many cases, symptoms do not appear immediately and may develop months or even years after cancer treatment has been completed.

Who Is Most at Risk?

The likelihood of developing lymphoedema depends on several treatment-related and personal factors. The risk is generally higher in people who have:

• Radiation therapy combined with lymph node removal
• Treatment for breast cancer
• Head and neck cancer treatment involving lymph nodes
• Gynaecological cancers
• Melanoma affecting the lymphatic system
• Received higher doses of radiation
• Obesity
• Recurrent infections

Reduced movement or limited physical activity after treatment

Although these factors increase the risk, they do not mean that lymphoedema will definitely develop.

Early Signs of Lymphoedema

Recognising symptoms early allows treatment to begin before swelling becomes more severe. Common signs include:

• Swelling in the arm, leg, neck, or other affected area
• A feeling of heaviness or fullness
• Tightness of the skin
• Reduced flexibility or movement
• Changes in skin texture
• Rings, watches, or clothing feeling tighter than usual

If these symptoms persist, it is important to discuss them with your healthcare team.

How Is Radiation-Induced Lymphoedema Treated?

Although lymphoedema cannot always be cured, several treatments can help reduce swelling, improve comfort, and maintain function.

Manual Lymphatic Drainage (MLD)

Manual lymphatic drainage (MLD) is a specialised massage technique performed by trained therapists. It uses gentle, rhythmic movements to encourage lymph fluid to move through healthy lymphatic pathways, helping reduce swelling and improve drainage.

Compression Therapy

Compression therapy is one of the most effective ways to manage lymphoedema.

• Compression garments such as sleeves, stockings, or gloves apply consistent pressure to help prevent fluid from accumulating after swelling has been reduced.
• Compression bandaging is often used during the initial phase of treatment when swelling is more significant. Special multilayer bandages help move fluid out of the affected limb before patients transition to compression garments for long-term management.

Exercise and Rehabilitation

Exercise plays an important role in lymphoedema management and rehabilitation after cancer. If you're wondering what exercises help lymphoedema, gentle stretching, walking, range-of-motion exercises, and supervised resistance training can help improve mobility and support healthy lymph flow. 

Can Lymphoedema Be Prevented?

Although lymphoedema cannot always be prevented, certain measures may help reduce the risk or limit its severity:

• Practise good skin care to reduce the risk of infection.
• Maintain a healthy body weight.
• Stay physically active and avoid prolonged inactivity.
• Protect the affected limb from cuts, burns, and injuries.
• Attend regular follow-up appointments after cancer treatment.
• Report any swelling or feelings of heaviness as early as possible.

Early intervention often leads to better symptom control.

When Should You See Your Doctor?

You should seek medical advice if you notice sudden or persistent swelling, redness, increasing pain, signs of infection, or reduced movement in the affected limb. Prompt assessment allows your healthcare team to identify the cause of your symptoms and begin appropriate treatment before lymphoedema progresses.

Early Care Can Improve Long-Term Outcomes

Radiation therapy remains one of the most effective treatments for many cancers, but it can occasionally lead to lymphoedema as a long-term side effect. Recognising symptoms early and understanding your individual risk can help ensure timely diagnosis and treatment.

At AS LifeLine Cancer Care, our multidisciplinary team provides comprehensive support throughout every stage of cancer treatment and recovery. Through personalised care, including manual lymphatic drainage (MLD), compression garments, compression bandaging, and rehabilitation after cancer, we help patients effectively manage lymphoedema and maintain their quality of life.

Book an appointment with our specialists today to learn more about managing the long-term effects of cancer treatment and supporting your recovery.

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