Is This Normal? · Lymphedema
The short answer on lymphedema
It might be. A heavy, full feeling in the arm and rings that suddenly feel snug are two of the early signs of lymphedema, a kind of swelling that can follow lymph node surgery or radiation. It can also be ordinary healing, especially in the first several weeks after surgery. Either way, it's worth a call to your care team now, because lymphedema caught early is easier to treat.
What to know about lymphedema
- Lymph node surgery is the main risk. Removing more nodes from the armpit, and radiation to that area, raise the odds.
- It can start late. It may show up soon after treatment or months to years later.
- Early signs are subtle. Heaviness, tightness, tingling, a snug ring or sleeve, or a hand that looks a little puffier.
- It's treatable. A trained lymphedema therapist, compression and exercise are the core of care.
- Infection is the urgent part. A red, hot, painful arm, or a fever, needs a call right away.
What is lymphedema after breast cancer?
The National Cancer Institute describes lymphedema as swelling from lymph fluid collecting between the skin and the muscle. Surgery can disrupt the flow of that fluid, and radiation can leave scar tissue that blocks it.
It usually shows up in the arm or hand on the treated side, but Breastcancer.org notes it can also affect the breast, chest, armpit, trunk or back. It's long-term and can't be cured, the National Cancer Institute says, but it can be treated.
Who is at risk of lymphedema after breast cancer, and how much?
Lymph node surgery. The more nodes removed, the higher the risk. After a sentinel node biopsy, which removes just a few, Memorial Sloan Kettering puts the risk at about 5 to 7 in 100. After an axillary dissection, which removes many more, it says up to about 1 in 4.
Other sources give different numbers. Breastcancer.org, citing the National Cancer Institute, gives 5% to 17% after sentinel node biopsy and 20% to 53% after axillary dissection. The National Cancer Institute's clinician summary cites one analysis that found 5.6% versus 19.9%. Studies measure and define it in different ways, but all agree the risk is clearly higher after axillary dissection.
Radiation and other factors. Radiation to the lymph nodes also raises the risk. A 2016 Massachusetts General Hospital study linked arm swelling to node radiation, axillary dissection, a body mass index of 25 or higher, and cellulitis, a skin infection. Memorial Sloan Kettering adds that Black and Hispanic women who've had axillary dissection face the highest risk.
Timing. The National Cancer Institute says lymphedema most often develops slowly over months or years. Memorial Sloan Kettering says it usually starts within the first few years.
What are the early signs of lymphedema?
It often starts as a feeling. Breastcancer.org says tingling or numbness can come and go before any swelling shows. Other signs:
Heaviness or fullness. The arm, breast or chest feels heavier, achy or tight, or the arm tires easily.
Things fit differently. Memorial Sloan Kettering lists rings that feel tighter or won't fit, and a shirt sleeve that feels tighter on one side.
Your hand looks a little different. The veins or tendons on the back of the hand are harder to see. The knuckles look less defined, or skin that used to wrinkle looks smoother.
Swelling that dents. Pressing on the area leaves a mark that stays for a moment.
How can you tell normal swelling after surgery from lymphedema?
Memorial Sloan Kettering says mild swelling after surgery is normal and can last up to about six weeks, slowly easing as you heal. Lymphedema may stay mild and steady or slowly worsen, and it can appear long after surgical swelling is gone.
So swelling that's new, that lingers past those first weeks, or that shows up months later is worth having checked. One pattern is urgent. Breastcancer.org says swelling that gets much bigger within a day or two needs medical attention right away, because it can point to infection, a blood clot or cancer that has come back.
How is lymphedema diagnosed?
It starts with an exam comparing the swollen arm with the other one, the National Cancer Institute says. Your team may also use:
Measurements. A tape measure around both arms, or measuring each arm's volume, with water or a device called a perometer. The National Cancer Institute notes that some experts treat a difference of 2 centimeters or more as meaningful.
Bioimpedance spectroscopy. A test that estimates fluid in the arm. The National Cancer Institute lists it among the tools used to check for lymphedema.
Imaging. Such as ultrasound, MRI or lymphoscintigraphy, a scan of how lymph fluid moves.
Lymphedema is staged from 0 to 3, and Breastcancer.org says stages 0 and 1 are often reversible. That's the best reason not to wait.
How is lymphedema treated?
A certified lymphedema therapist. Often a physical or occupational therapist who has trained specifically in lymphedema. Ask for a referral.
Complete decongestive therapy. The National Cancer Institute calls it the standard of care for more established lymphedema, though the ideal program hasn't been settled. It combines gentle massage that moves fluid (manual lymphatic drainage), compression bandaging, exercise and skin care, daily for an average of about 15 days, then a maintenance phase, often with a fitted sleeve.
Compression. Sleeves, wraps or bandages. Some people also use a pump with a sleeve that inflates and deflates.
Exercise. Women were long told to baby the arm. The evidence points the other way. In one trial of women at risk, the group assigned to a weight-lifting program had less arm swelling, not more: 11% compared with 17% in the group that didn't lift. The National Cancer Institute says early worries that exercise causes harm haven't been confirmed, and women who already had lymphedema had fewer symptoms with exercise. There isn't enough data on unsupervised exercise, so start with guidance and build slowly.
When that's not enough. For advanced cases, surgeons can reroute lymph vessels, transfer lymph nodes or remove fatty tissue. Memorial Sloan Kettering says there are no approved medicines for lymphedema swelling.
Do blood pressure cuffs, needles or flying cause lymphedema?
Many women were told never to allow blood pressure checks, blood draws or shots on the treated arm, and to be wary of flying. The research is less certain than those rules suggest, and sources don't fully agree.
The newer research. The Massachusetts General Hospital study measured patients' arms over time. Blood draws, injections and blood pressure readings on the treated arm, and air travel, weren't significantly linked to arm swelling. Cellulitis was. A 2016 review of 31 studies in The Lancet Oncology found the evidence on these precautions mostly weak or inconclusive, with skin infection standing out as a clear risk. The authors called for advice matched to each person's risk.
The cautious view. The National Cancer Institute's patient page still advises against blood pressure readings and blood draws on that arm. Memorial Sloan Kettering suggests asking for the other arm first, and always using it once you have signs of lymphedema, but says the treated arm can be used when there's no other option.
Flying. The National Lymphedema Network says there's little evidence that air travel causes or worsens lymphedema. If you have it, wear your usual fitted garment when you fly. If you're only at risk, it can't recommend for or against a sleeve.
The practical takeaway: asking for the other arm costs nothing. If that isn't possible, the newer research is reassuring. Ask your team what makes sense for you.
Why is infection the urgent risk with lymphedema?
The National Cancer Institute calls cellulitis, a skin infection, a common and potentially life-threatening complication of lymphedema. Watch for pain, tenderness, redness, swelling or warmth in the arm or chest, and fever. It's treated with antibiotics. Clean and cover cuts, burns and bug bites on that side promptly.
When to call your care team about arm swelling or lymphedema
- Redness, warmth, pain or tenderness in your arm, hand, breast or chest. Call right away.
- A fever, especially with any of the above
- Swelling that gets much bigger within a day or two
- New heaviness, tightness or swelling, or rings or sleeves that suddenly fit tighter
- Swelling after surgery that isn't easing after several weeks
If it feels like an emergency, call 911.
Questions to ask your care team about lymphedema
- How many lymph nodes were removed, and did I have radiation to the nodes? What does that mean for my risk?
- Can you measure both arms now for a baseline? Is bioimpedance testing available here?
- Can you refer me to a certified lymphedema therapist?
- Which exercises are right for me, and how should I build up to lifting?
- Should I ask for blood draws and blood pressure readings on my other arm?
- Do I need a compression sleeve for flying or exercise, and who should fit it?
Still recovering from surgery? Read what happens during a mastectomy.
Sources: National Cancer Institute, Lymphedema and Cancer (updated March 6, 2024); National Cancer Institute, Lymphedema (PDQ®)–Health Professional Version (updated December 18, 2024); Memorial Sloan Kettering Cancer Center, Lymphedema After Breast Cancer Treatment (updated October 1, 2024); Memorial Sloan Kettering Cancer Center, Common Questions about Breast Cancer-Related Lymphedema (updated March 29, 2021); Breastcancer.org, Lymphedema: Symptoms, Treatment, and Risk Factors (updated March 12, 2026); National Lymphedema Network, Lymphedema Risk Reduction Practices (2012); Ferguson CM et al., Impact of Ipsilateral Blood Draws, Injections, Blood Pressure Measurements, and Air Travel on the Risk of Lymphedema for Patients Treated for Breast Cancer, Journal of Clinical Oncology (2016); Asdourian MS et al., Precautions for breast cancer-related lymphoedema, The Lancet Oncology (2016). This article is general information, written in Babette's own words, and is not a substitute for advice from your care team.
