Chronic Lymphedema

How lymphedema develops

The lymphatic system is a network of vessels and nodes that collects excess fluid, protein and immune cells from tissues and returns them to the bloodstream. When vessels or nodes are damaged or missing, protein-rich fluid builds up in the tissues. Over time, the trapped protein triggers inflammation, fat deposition and scarring (fibrosis), which is why chronic lymphedema becomes firmer and harder to reverse.

Types and causes

Secondary lymphedema (most common)

• Cancer treatment: removal of lymph nodes (for example, axillary node dissection for breast cancer, or groin nodes for melanoma, gynecologic or prostate cancers) and radiotherapy. Risk is lower after sentinel node biopsy than full node removal. It can appear months or years after treatment.
• Cancer itself blocking lymph nodes.
• Infection: repeated cellulitis; worldwide, lymphatic filariasis (a parasitic infection) is a major cause.
• Obesity: severe obesity can overwhelm lymphatic drainage.
• Chronic venous insufficiency and immobility.
• Trauma or surgery that damages lymph vessels.

Primary lymphedema

Caused by abnormally developed lymphatics, often inherited. It can appear at birth (Milroy disease), around puberty (lymphedema praecox), or after age 35 (lymphedema tarda), and usually affects the legs.

Symptoms

• swelling of part or all of an arm or leg, including fingers or toes
• heaviness, tightness or aching
• clothing, rings, watches or shoes feeling tight
• reduced flexibility of nearby joints
• skin that becomes thick, hard or rough
• recurrent infections
• in later stages, skin folds, warty growths and fluid leakage

Lymphedema can also affect the breast, chest wall, head and neck, or genitals.

Stages (International Society of Lymphology)

Diagnosis

Lymphedema is usually diagnosed by history and examination: a doctor compares limb circumference or volume between sides. Other causes of swelling, such as deep vein thrombosis, heart, kidney or liver disease, lipedema and venous disease, are ruled out. Tests may include:

• limb measurements or perometry
• bioimpedance spectroscopy, which can detect early fluid build-up
• lymphoscintigraphy, a scan using a tracer to show lymph flow
• indocyanine green (ICG) lymphography
• ultrasound to exclude blood clots

Treatment

Complete decongestive therapy (CDT)

The standard treatment, delivered by a certified lymphedema therapist in two phases:

1. Intensive phase: manual lymphatic drainage (a gentle massage that redirects fluid to working lymph vessels), multilayer compression bandaging, exercises and skin care, often daily for 2 to 4 weeks.
2. Maintenance phase: daily compression garments, exercise, skin care and self-massage.

Compression

Fitted compression sleeves, stockings or wraps are the foundation of long-term control. They should be professionally measured and replaced every 4 to 6 months. Pneumatic compression pumps help some people.

Exercise

Regular movement and strength training, gradually increased, help the muscles pump lymph and do not worsen lymphedema when built up safely. Wear compression while exercising.

Skin care and infection prevention

• moisturize daily to prevent cracks
• protect the limb from cuts, burns, insect bites and sunburn
• treat athlete's foot promptly
• seek treatment early for redness or warmth; people with recurrent cellulitis may be given standby or preventive antibiotics

Weight management

Losing excess weight reduces swelling and improves response to treatment.

Surgery

For selected people who do not respond enough to conservative care:

• lymphaticovenous anastomosis: connects lymph vessels to small veins
• vascularized lymph node transfer: moves healthy lymph nodes to the affected area
• liposuction to remove fatty, fibrotic tissue in advanced cases, followed by lifelong compression

Outlook

Lymphedema is a lifelong condition, but with consistent management most people keep swelling stable, avoid infections and stay active. Early treatment, at stage 0 or I, gives the best results.

Frequently asked questions

What is chronic lymphedema?

Chronic lymphedema is long-lasting swelling caused by damage to the lymphatic system, which normally drains fluid from tissues. It most often affects an arm or leg after cancer surgery or radiotherapy. It can also be inherited or follow infection, injury or obesity.

What are the first signs of lymphedema?

Early signs include a feeling of heaviness, tightness or fullness in a limb, rings, watches or sleeves feeling tighter, and mild swelling that goes down overnight. Some people notice reduced flexibility in the wrist, hand or ankle.

Can lymphedema be cured?

There is no cure, but it can be controlled. Compression garments, specialist massage, exercise and skin care keep swelling down and prevent progression. Some people benefit from surgery to improve lymph drainage or remove excess tissue.

Is exercise safe with lymphedema?

Yes. Gradually increased exercise, including strength training, is safe and helps lymph flow. Start slowly, wear compression garments during exercise, and watch for any increase in swelling. A lymphedema therapist can design a suitable program.

Why is cellulitis a risk with lymphedema?

Fluid rich in protein and reduced immune cell traffic make the skin more vulnerable to bacterial infection. Cellulitis then damages lymph vessels further, worsening swelling. Good skin care and prompt treatment of any redness or warmth are essential.