Lymphedema refers to swelling that generally occurs in one of your arms or legs. Sometimes both arms or both legs swell.

Lymphedema is most commonly caused by the removal of or damage to your lymph nodes as a part of cancer treatment. It results from a blockage in your lymphatic system, which is part of your immune system. The blockage prevents lymph fluid from draining well, and the fluid buildup leads to swelling.

There's no cure for lymphedema. But it can be managed with early diagnosis and diligent care of your affected limb.

Lymphedema signs and symptoms, which occur in your affected arm or leg, include:

  • Swelling of part or all of your arm or leg, including fingers or toes
  • A feeling of heaviness or tightness
  • Restricted range of motion
  • Aching or discomfort
  • Recurring infections
  • Hardening and thickening of the skin (fibrosis)

The swelling caused by lymphedema ranges from mild, hardly noticeable changes in the size of your arm or leg to extreme changes that make the limb hard to use. Lymphedema caused by cancer treatment may not occur until months or years after treatment.

When to see a doctor

Make an appointment with your doctor if you notice persistent swelling in your arm or leg.

Your lymphatic system is crucial to keeping your body healthy. It circulates protein-rich lymph fluid throughout your body, collecting bacteria, viruses and waste products. Your lymphatic system carries this fluid and harmful substances through your lymph vessels, which lead to lymph nodes. The wastes are then filtered out by lymphocytes — infection-fighting cells that live in your lymph nodes — and ultimately flushed from your body.

Lymphedema occurs when your lymph vessels are unable to adequately drain lymph fluid, usually from an arm or leg. Lymphedema can be either primary or secondary. This means it can occur on its own (primary lymphedema) or it can be caused by another disease or condition (secondary lymphedema). Secondary lymphedema is far more common than primary lymphedema.

Causes of secondary lymphedema

Any condition or procedure that damages your lymph nodes or lymph vessels can cause lymphedema. Causes include:

  • Surgery. Removal of or injury to lymph nodes and lymph vessels may result in lymphedema. For example, lymph nodes may be removed to check for spread of breast cancer, and lymph nodes may be injured in surgery that involves blood vessels in your limbs.
  • Radiation treatment for cancer. Radiation can cause scarring and inflammation of your lymph nodes or lymph vessels.
  • Cancer. If cancer cells block lymphatic vessels, lymphedema may result. For instance, a tumor growing near a lymph node or lymph vessel could enlarge enough to block the flow of the lymph fluid.
  • Infection. An infection of the lymph nodes or parasites can restrict the flow of lymph fluid. Infection-related lymphedema is most common in tropical and subtropical regions and is more likely to occur in developing countries.

Causes of primary lymphedema

Primary lymphedema is a rare, inherited condition caused by problems with the development of lymph vessels in your body. Specific causes of primary lymphedema include:

  • Milroy's disease (congenital lymphedema). This disorder begins in infancy and causes lymph nodes to form abnormally.
  • Meige's disease (lymphedema praecox). This disorder often causes lymphedema around puberty or during pregnancy, though it can occur later, until age 35.
  • Late-onset lymphedema (lymphedema tarda). This occurs rarely and usually begins after age 35.

Factors that may increase your risk of developing lymphedema after cancer, cancer treatment or other secondary causes include:

  • Older age
  • Excess weight or obesity
  • Rheumatoid or psoriatic arthritis

Lymphedema in your arm or leg can lead to serious complications, such as:

  • Infections. Possible infections that can result from lymphedema include a serious bacterial infection of the skin (cellulitis) and an infection of the lymph vessels (lymphangitis). The smallest injury to your arm or leg can be an entry point for infection.
  • Lymphangiosarcoma. This rare form of soft tissue cancer can result from the most-severe cases of untreated lymphedema. Possible signs of lymphangiosarcoma include blue-red or purple marks on the skin.

Here's some information to help you get ready for your appointment with your doctor.

What you can do

List the following:

  • Your symptoms, including any that may seem unrelated to the reason for which you scheduled the appointment.
  • Key personal information, including major illnesses, cancer treatments or recent life changes.
  • Medications, vitamins and supplements you take.
  • Questions to ask your doctor.

For lymphedema, some basic questions to ask your doctor include:

  • What's the likeliest cause of this swelling?
  • Could there be another cause?
  • What tests do I need? Do these tests require special preparation?
  • Is the swelling temporary or long lasting?
  • What's the treatment for lymphedema?
  • Are there alternatives to the approach you're suggesting?
  • Are there medications to ease the swelling?
  • I have other health conditions. How can I best manage them together?
  • Do I need to restrict my diet or activities?
  • Do you have brochures or other printed material that I can take? What websites do you recommend?

Don't hesitate to ask other questions, as well.

What to expect from your doctor

Your doctor is likely to ask you a number of questions, such as:

  • When did the swelling begin?
  • Do you have other signs or symptoms?
  • Has the swelling been continuous or occasional?
  • Does anything seem to make the swelling better?
  • Does anything seem to worsen your symptoms?

What you can do in the meantime

Keep your swollen limb elevated as much as possible and protect your skin from injury. The swelling from lymphedema might dull pain from an injury or burn, so don't use heating pads on the affected limb. Moisturize your skin daily.

If you're at risk of lymphedema — for instance, if you've recently had cancer surgery involving your lymph nodes — your doctor may diagnose lymphedema based on your signs and symptoms.

If the cause of your lymphedema isn't as obvious, your doctor may order imaging tests to get a look at your lymph system. Tests may include:

  • MRI scan. Using a magnetic field and radio waves, an MRI produces 3-D, high-resolution images.
  • CT scan. This X-ray technique produces detailed, cross-sectional images of your body's structures. CT scans can reveal blockages in the lymphatic system.
  • Doppler ultrasound. This variation of the conventional ultrasound looks at blood flow and pressure by bouncing high-frequency sound waves (ultrasound) off red blood cells. Ultrasound can help find obstructions.
  • Radionuclide imaging of your lymphatic system (lymphoscintigraphy). During this test you're injected with a radioactive dye and then scanned by a machine. The resulting images show the dye moving through your lymph vessels, highlighting blockages.

There's no cure for lymphedema. Treatment focuses on reducing the swelling and controlling the pain. Lymphedema treatments include:

  • Exercises. Light exercises in which you move your affected limb may encourage lymph fluid drainage and help prepare you for everyday tasks, such as carrying groceries. Exercises shouldn't be strenuous or tire you but should focus on gentle contraction of the muscles in your arm or leg. A certified lymphedema therapist can teach you exercises that may help.
  • Wrapping your arm or leg. Bandaging your entire limb encourages lymph fluid to flow back toward the trunk of your body. The bandage should be tightest around your fingers or toes and loosen as it moves up your arm or leg. A lymphedema therapist can show you how to wrap your limb.
  • Massage. A special massage technique called manual lymph drainage may encourage the flow of lymph fluid out of your arm or leg. Be sure to have it done by someone specially trained in the technique.

    Massage isn't for everyone. Avoid massage if you have a skin infection, active cancer, blood clots or congestive heart failure. Also avoid massage on areas of your body that have received radiation therapy.

  • Pneumatic compression. A sleeve worn over your affected arm or leg connects to a pump that intermittently inflates the sleeve, putting pressure on your limb and moving lymph fluid away from your fingers or toes.
  • Compression garments. Long sleeves or stockings made to compress your arm or leg encourage the flow of the lymph fluid out of your affected limb. Wear a compression garment when exercising the affected limb.

    Obtain a correct fit for your compression garment by getting professional help. Ask your doctor where you can buy compression garments in your community. Some people will require custom-made compression garments.

  • Complete decongestive therapy (CDT). This approach involves combining therapies with lifestyle changes. Generally, CDT isn't recommended for people who have high blood pressure, diabetes, paralysis, heart failure, blood clots or acute infections.

In cases of severe lymphedema, your doctor may consider surgery to remove excess tissue in your arm or leg to reduce swelling.

It can be frustrating to know there's no cure for lymphedema. However, you can control some aspects of lymphedema. To help you cope, try to:

  • Find out all you can about lymphedema. Knowing what lymphedema is and what causes it can help you communicate with your doctor or physical therapist.
  • Take care of your affected limb. Do your best to prevent complications in your arm or leg. Clean your skin daily, looking over every inch of your affected limb for signs of trouble, such as cracks and cuts. Apply lotion to prevent dry skin.
  • Take care of your whole body. Eat a diet rich in fruits and vegetables. Exercise daily, if you can. Reduce stress. Try to get enough sleep. Taking care of your body gives you more energy and encourages healing.
  • Get support from others with lymphedema. Whether you attend support group meetings in your community or participate in online message boards and chat rooms, it helps to talk to people who understand what you're going through. Contact the National Lymphedema Network to find support groups in your area. They can also put you in touch with other people with lymphedema.

If you've had or are going to have cancer surgery, ask your doctor whether your procedure will involve your lymph nodes or lymph vessels. Ask if your radiation treatment will be aimed at lymph nodes, so you'll be aware of the possible risks.

To reduce your risk of lymphedema, try to:

  • Protect your arm or leg. Avoid injury to your affected limb. Cuts, scrapes and burns can invite infection. Protect yourself from sharp objects. For example, shave with an electric razor, wear gloves when you garden or cook, and use a thimble when you sew. If possible, avoid medical procedures, such as blood draws and vaccinations, in your affected limb.
  • Rest your arm or leg while recovering. After cancer treatment, exercise and stretching are encouraged. But avoid strenuous activity until you've recovered from surgery or radiation.
  • Avoid heat on your arm or leg. Don't apply ice or heat, such as with a heating pad, to your affected limb. Also, protect your affected limb from extreme cold.
  • Elevate your arm or leg. Whenever possible, elevate your affected limb above the level of your heart.
  • Avoid tight clothing. Avoid anything that could constrict your arm or leg, such as tightfitting clothing and, in the case of your arm, blood pressure cuffs. Ask that your blood pressure be taken in your other arm.
  • Keep your arm or leg clean. Make skin and nail care high priorities. Inspect the skin on your arm or leg daily, watching for changes or breaks in your skin that could lead to infection. Don't go barefoot.
  • Experience. Each year Mayo Clinic doctors trained in physical medicine and rehabilitation, blood vessel conditions (vascular medicine), blood vessel surgery (vascular surgery) and other areas treat more than 2,500 people who have lymphedema.
  • Team approach. Mayo Clinic doctors work together to evaluate and treat people who have lymphedema.
  • Individualized treatment. Mayo Clinic doctors and therapists work with you to reduce the swelling in your limbs, develop your individualized lymphedema treatment program and arrange for your follow-up care.
  • Diagnostic tests. Mayo Clinic doctors use many tests to determine the cause of your swelling and evaluate your condition. Tests may include lymphoscintigraphy, MRI scan, CT scan and others.

Mayo Clinic in Rochester, Minn., is ranked among the Best Hospitals for heart and heart surgery and for rehabilitation by U.S. News & World Report.

At Mayo Clinic, we assemble a team of specialists who take the time to listen and thoroughly understand your health issues and concerns. We tailor the care you receive to your personal health care needs. You can trust our specialists to collaborate and offer you the best possible outcomes, safety and service.

Mayo Clinic is a not-for-profit medical institution that reinvests all earnings into improving medical practice, research and education. We're constantly involved in innovation and medical research, finding solutions to improve your care and quality of life. Your doctor or someone on your medical team is likely involved in research related to your condition.

Our patients tell us that the quality of their interactions, our attention to detail and the efficiency of their visits mean health care — and trusted answers — like they've never experienced.

Why Choose Mayo Clinic

What Sets Mayo Clinic Apart

Mayo Clinic works with hundreds of insurance companies and is an in-network provider for millions of people. In most cases, Mayo Clinic doesn't require a physician referral. Some insurers require referrals or may have additional requirements for certain medical care. All appointments are prioritized on the basis of medical need.

Doctors trained in physical medicine and rehabilitation, vascular diseases, vascular and endovascular surgery, cardiovascular diseases, and plastic surgery diagnose and treat people who have lymphedema at Mayo Clinic's campus in Arizona.

For appointments or more information, call the Central Appointment Office at 800-446-2279 (toll-free) 8 a.m. to 5 p.m. Mountain Standard Time, Monday through Friday or complete an online appointment request form.

Doctors trained in physical medicine and rehabilitation, vascular diseases, vascular and endovascular surgery, cardiovascular diseases, plastic surgery, and dermatology diagnose and treat people who have lymphedema at Mayo Clinic's campus in Florida.

For appointments or more information, call the Central Appointment Office at 904-953-0853 8 a.m. to 5 p.m. Eastern time, Monday through Friday or complete an online appointment request form.

Doctors trained in physical medicine and rehabilitation, vascular diseases, vascular and endovascular surgery, cardiovascular diseases, and plastic surgery diagnose and treat people who have lymphedema at Mayo Clinic's campus in Minnesota.

For appointments or more information, call the Central Appointment Office at 507-538-3270 7 a.m. to 6 p.m. Central time, Monday through Friday or complete an online appointment request form.

See information on patient services at the three Mayo Clinic locations, including transportation options and lodging.

Mayo Clinic doctors and therapists research prevention, diagnosis and treatment options for lymphedema. Read more on the physical medicine and rehabilitation research website.

See a list of publications by Mayo Clinic doctors on lymphedema on PubMed, a service of the National Library of Medicine.

Oct. 23, 2014