Medical Oncologist
After your operation
Cording (axillary web syndrome) after surgery
Cording means tight bands appearing under the skin from the armpit down the inner arm, sometimes as far as the wrist. They look like pulled strings when you lift your arm and they feel alarming. They are not dangerous, they are not a clot, and they respond well to stretching. Resting the arm makes them worse.
MM
Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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The short answer
What are these tight cords under my arm?
Cording, also called axillary web syndrome. Tight bands appear under the skin running from the armpit down the inner arm, sometimes as far as the wrist. They feel alarming and look like guitar strings pulled tight when you lift your arm. They are not dangerous and they respond well to stretching.
What is actually happening
The cords are thought to be lymph channels and surrounding tissue that have become inflamed and scarred after node surgery. They tighten and shorten, which is why they limit how far you can raise the arm.
When it usually appears
Most often in the weeks after surgery rather than immediately, which catches women out just as they were feeling better. It can also appear months later, or return after it had settled.
What it is not
It is not a blood clot, it is not the cancer, and it is not a sign that anything went wrong with your operation. It is not lymphoedema either, though the two can occur in the same arm.
Cording responds to movement. Resting the arm makes it worse, which is the opposite of most people's instinct.What helps
How cording is treated
Almost all of it is movement, done gently and regularly.
Stretching, several times a day
Slow, sustained stretches taking the arm out and up to the point of tightness, held and released. Little and often works far better than one hard session.
A physiotherapist
The single most useful referral. They can release cords with specific hands-on techniques and give you a programme. Ask rather than waiting to be offered one.
Ask for a physiotherapist experienced in breast cancer if one is available.Warmth before stretching
A warm shower or a covered heat pack before exercises makes the tissue more willing to lengthen. Take care with heat on numb skin, which burns without warning.
Pain relief, taken beforehand
Cording stretches hurt, and being on top of pain lets you do them properly. Taking a simple painkiller half an hour before is a legitimate part of treatment, not weakness.
Do not
- Force a cord until it snaps
- Rest the arm to protect it
- Massage hard over a fresh wound
Not sure whether this applies to you?
Ask an oncologistSide by side
Cording, and the things it gets confused with
What you notice
What it usually is
Visible tight bands, worse when you raise the arm
Cording. Stretch it, and ask for physiotherapy
Soft puffy swelling of the whole arm or hand
Lymphoedema. Different problem, needs assessment
Red, hot, painful arm with fever
Infection. Same-day assessment
Deep calf or arm pain with swelling and warmth
Possible clot. Same-day assessment
Stiff shoulder without visible cords
Shoulder stiffness. Also physiotherapy
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Words you will hear
The vocabulary, in plain language
- Axillary web syndrome
- The medical name for cording. Axillary means armpit; the web describes how the bands look when the arm is raised.
- Cord
- The tight band itself. There may be one or several, and they can run from the armpit to the elbow or wrist.
- Range of movement
- How far you can raise and rotate the arm. This is what physiotherapists measure to track progress.
- Myofascial release
- Hands-on techniques a physiotherapist uses to free tight tissue. Effective for cording.
- Lymphoedema
- Lasting swelling from damaged lymph drainage. A separate condition, though it can affect the same arm.
- Snapping
- A cord suddenly releasing during a stretch, sometimes with an audible pop. Startling, usually followed by better movement.
Being straight with you
What to expect, honestly
Most cording settles within a few weeks to a few months with regular stretching. Some women have cords that come and go for longer, and a small number have them recur months later. None of that indicates a problem with your cancer treatment.
It can delay radiotherapy positioning
Radiotherapy needs your arm raised and held above your head, and a tight cord can make that impossible to hold comfortably. This is a practical reason to start stretching early rather than waiting for it to settle on its own.
The snap is alarming and usually fine
A cord sometimes releases suddenly during a stretch, occasionally with a pop you can hear. Women find this frightening. It is generally followed by noticeably better movement, and it is not damage.
Tell your team, even though it is not dangerous
Cording is common enough that many women assume it is not worth mentioning, and then struggle alone with an arm they cannot lift. It is the single most treatable problem of this period, and a physiotherapy referral usually resolves it far faster than stretching unaided. Raise it at your next appointment rather than waiting to be asked.
Rest is the wrong instinct
Everything about cording feels like it should be protected and rested. Doing that allows the cords to tighten further and the shoulder to stiffen alongside them, which is a harder and longer problem. Gentle, frequent movement is the treatment.
Commonly believed
What families say about the cords
It looks like a blood clot in the arm.
Cording is inflamed lymph channels and scar tissue, not a clot. A clot causes a swollen, warm, painful arm rather than visible bands that tighten when you lift. If you are unsure, have it checked rather than guessing, but cording is far more common.
She should rest the arm until the cords go.
This is the most damaging advice here. Cords shorten further when the arm is not used, and the shoulder stiffens alongside them. Gentle stretching several times a day is what resolves it.
The cords need to be broken by force.
Slow sustained stretching is what lengthens them. Forcing or yanking risks tearing tissue and setting recovery back. If a cord releases on its own during a gentle stretch, that is fine; do not chase it.
It means lymphoedema is coming.
Cording and lymphoedema are separate conditions, though both follow node surgery. Having one does not mean you will get the other. Keeping the arm moving and reporting any persistent swelling early is sensible for both.
Questions we are asked
Common questions about cording
How long does cording last?
Usually a few weeks to a few months with regular stretching, and faster with physiotherapy. Some women find cords come and go for longer, or return after settling. Persistent cording is uncomfortable rather than dangerous, and it remains treatable at any point.
Should I stretch until it hurts?
Stretch to the point of tightness and mild discomfort, hold, then release. Sharp pain means you have gone too far. Little and often beats one hard session, and taking a simple painkiller beforehand is entirely reasonable.
Is it safe if a cord snaps?
Generally yes, and movement is usually noticeably better afterwards. It is startling and sometimes audible. If it is followed by significant new pain, bruising or swelling, mention it, but in most cases it simply marks the cord releasing.
Can I get cording after a sentinel node procedure?
Yes, though it is less common than after a full armpit clearance. Any node surgery can cause it. The treatment is the same regardless of which operation you had.
Will it stop me having radiotherapy?
It should not, but it can make holding the position uncomfortable, since your arm needs to be raised above your head. Tell your radiotherapy team, and start stretching early. They would rather know before planning than on the first day.
Does massage help?
Hands-on release by a physiotherapist experienced in breast cancer does help. Vigorous massage by someone untrained, particularly over a recent wound, is not advisable. Ask for a referral rather than going to a general massage therapist.
Can it come back after it has gone?
It can, sometimes months later or after a period of using the arm less. Going back to the stretches usually settles it again. If it recurs repeatedly, ask for another physiotherapy review rather than managing it alone.
Should I stop my exercises if the cords hurt?
No, but adjust them. Work within a range you can manage and build gradually, rather than stopping altogether. Stopping is what allows both the cords and the shoulder to tighten. Ask a physiotherapist to modify the programme for you.
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Speak to a breast cancer specialist
Call the helpline or leave your details, and someone will help you arrange a consultation at the CION centre nearest you. One helpline serves every CION centre.
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Sources
- Cancer Research UK — Problems after breast cancer surgery
- National Cancer Institute — Lymphedema and related conditions
- Breast Cancer Now — Cording after breast surgery
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.