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Shoulder stiffness and cording after a mastectomy | CION Cancer Clinics
The tight, rope-like string under the arm that pulls when you stretch is called cording, or axillary web syndrome. It is common after lymph nodes are removed, it is not cancer and it is not dangerous. Stretching is the treatment. This page explains what the cord is, how to tell it from a frozen shoulder or a fluid collection, and when to ask for help. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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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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On this page
- What is the tight cord under the arm after breast surgery?
- What else makes the shoulder stiff after a mastectomy?
- How is cording treated?
- What the physiotherapist and surgeon mean
- What families say about the cord, and what is actually true
- What this page cannot tell you
- Common questions about cording and shoulder stiffness
The short answer
What is the tight cord under the arm after breast surgery?
The tight, rope-like string you can feel or see under the arm when you stretch is called cording, or axillary web syndrome. It is common after lymph nodes (the small glands under the arm) are removed, it is not dangerous, and it usually softens with stretching and time.
What the cord actually is
Nobody is completely certain. The most accepted explanation is that small lymph vessels and veins under the arm become inflamed and scarred after the operation, and tighten into a band. The band runs from the armpit down the inner arm, sometimes as far as the wrist. It can be one cord or several.
What it feels like
Most people notice it when they first try to lift the arm out to the side or straighten the elbow with the arm raised. There is a sharp pull along the inner arm, and a firm string stands out under the skin. The arm may feel as if it will not go any further. Between stretches it can be quiet, which is why it catches people by surprise.
Who it tends to affect
It is more common after a full clearance of the lymph nodes than after a sentinel node biopsy, and more often seen in younger, slimmer women. It can happen to anyone who has had surgery under the arm.
Not every stiff shoulder is cording
What else makes the shoulder stiff after a mastectomy?
Four different things can limit the arm in the first months, and they are treated differently. Your physiotherapist can tell them apart by examining you.
Cording
A visible or palpable string under the arm that pulls when the arm is raised or the elbow straightened. Painful on stretch, often quiet at rest. Softens with stretching and gentle release work.
Scar tightness
The mastectomy scar and the skin around it shrink as they heal. The pull is across the chest rather than down the arm, and it is felt most when the arm goes above the head. Massage and stretching help.
Frozen shoulder
The shoulder joint itself stiffens because the arm was held still. Movement is limited in every direction, not only one, and it aches at night. This takes longest to recover and needs a proper physiotherapy programme.
This is the one that early exercise prevents.A fluid collection
Fluid can gather under the arm or in the chest wound after the drain comes out. It feels like a soft, heavy swelling and it limits the arm by getting in the way. The surgeon may need to draw it off with a needle.
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Call the same day if the arm changes like this
Cording itself is not an emergency. What needs a call the same day is an arm that becomes hot, red and swollen, a fever along with pain in the arm, or a tender, swollen vein that has come up suddenly. Those can be an infection or a clot, and both need to be seen, not stretched.
Getting the arm back
How is cording treated?
Stretching is the treatment. Everything else supports it.
Stretch into the pull
Raise the arm slowly until you feel the cord tighten, hold there and breathe, then ease a little further. A firm pull is the aim. Sharp pain is the signal to back off. Repeat several times a day.
Physiotherapy release
A physiotherapist who treats breast surgery patients can work along the cord with their hands and combine this with stretching. Some people feel or hear the cord give way during a session, which is expected and not harmful.
Moisturise and warm the skin
A warm shower before stretching and a plain moisturiser rubbed along the inner arm make the skin more comfortable to stretch. Do not massage the wound itself until it is fully healed.
Keep going once it eases
Cords can return in the first months, particularly if stretching stops. Keeping the arm moving daily is what stops it coming back. Simple pain relief before a session is fine if your doctor has agreed it.
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Words you will hear
What the physiotherapist and surgeon mean
- Axillary web syndrome
- The medical name for cording. Axilla means armpit; the web is the band or bands of tight tissue that form there.
- Axillary clearance
- Removal of most of the lymph nodes under the arm. Cording, numbness and arm swelling are all more likely after this than after a sentinel node biopsy.
- Sentinel node biopsy
- Removal of only the first few nodes that drain the breast, to check them. Cording can still happen, but less often.
- Range of motion
- How far the arm can move in each direction. The physiotherapist measures it at each visit to see whether the stretching is working.
- Adhesive capsulitis
- The medical name for frozen shoulder. A stiff joint capsule, not a cord, and a longer road back.
- Seroma
- A collection of clear fluid under the skin after surgery. It is common and is drawn off with a needle if it is large or uncomfortable.
Commonly believed
What families say about the cord, and what is actually true
"The cord means the cancer has spread along the arm."
It does not. Cording is scarred lymph vessels and veins, not tumour. It is a healing reaction to surgery under the arm and has nothing to do with whether the cancer has spread. If you are anxious about it, ask your surgeon to examine it at the next visit.
"Stretching the cord will snap something important."
The cord is not a nerve or a tendon. When a cord gives way during a stretch it is the band of scar tissue releasing, and the arm usually moves more freely afterwards. Stretching firmly but not violently is the treatment, not the risk.
"She should rest the arm until the cord goes away on its own."
Resting the arm lets the cord tighten further and lets the shoulder stiffen alongside it. Cords do often fade over time, but they fade faster and leave less stiffness behind if the arm is stretched every day.
"Cording means she will get lymphoedema."
The two share a cause, surgery to the lymph nodes, but one does not lead to the other. Most people with cording never develop long-term arm swelling.
Being straight with you
What this page cannot tell you
This page cannot tell you how long your own cord will take to soften. Some fade in a few weeks, some take months, and a few people have a cord that stays but stops limiting them. How many nodes were removed, whether radiotherapy follows, and how early the stretching starts all change the picture.
When to ask for a physiotherapy referral
If the arm cannot reach above the head by the time the wound has healed, if the cord is stopping you sleeping or dressing, or if radiotherapy is planned and the arm cannot yet be held up for it, ask now rather than at the next routine appointment.
Who should not self-treat this
If you have had a flap reconstruction, a skin graft, or the wound is not yet closed, stretching needs to be guided rather than done from a web page. The same applies if you had a shoulder injury before surgery, or if the arm has already started to swell.
If there is no physiotherapist near you, call the helpline. We can talk you through the stretches and tell you what a cord should and should not feel like.Questions we are asked
Common questions about cording and shoulder stiffness
When does cording usually appear?
Most often in the first weeks after surgery, around the time the drain has come out and you start to stretch further. Some people notice it only when they begin radiotherapy planning and have to hold the arm above the head. It can occasionally appear months later after a period of not moving the arm.
I can see the string standing out under the skin. Is that normal?
Yes. When the arm is stretched out, the cord often stands out under the skin of the armpit and inner arm like a tight guitar string. It can look alarming the first time. It is scar tissue in the small vessels, not a vein about to burst and not a lump that needs a biopsy.
It popped during a stretch. Have I torn something?
Almost certainly not. A cord that suddenly gives way with a small pop and then lets the arm move further is the band releasing, and it is a good sign. If the pop was followed by swelling, bruising or the arm becoming much more painful, stop and get it checked that day.
Can I get cording after a sentinel node biopsy only?
Yes, though it is less common than after a full clearance. Even removing a few nodes disturbs the small vessels under the arm. The treatment is the same: stretch into the pull every day and ask for physiotherapy if it is not easing.
Does the cord affect radiotherapy?
It can delay it. Radiotherapy to the chest wall is given with the arm raised above the head, and the position has to be held still. If a cord stops the arm reaching that position, planning waits until it does. This is why the team pushes the stretching so hard after surgery.
Will it come back after it has gone?
It can, mostly in the first months and mostly when stretching stops. The cord you feel again is usually easier to release than the first one. Keeping a short daily stretch going for as long as your team suggests is what prevents it, not any medicine.
Is there a tablet or injection for it?
No medicine dissolves a cord. Simple pain relief that your doctor has already agreed can make stretching more comfortable, and that is its only role. Do not take anything new, or change a dose, without asking the team who prescribed it.
Where can I find a physiotherapist who knows about this?
Ask the surgeon or breast care nurse at the centre where you had the operation. Most cancer centres in Hyderabad have a physiotherapist who sees breast surgery patients. If you are in a district and travel is hard, call the helpline and we will point you to the nearest option we know of.
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Sources
- Cancer Research UK — Surgery for breast cancer
- American Cancer Society — Exercises After Breast Cancer Surgery
- NHS — Mastectomy
- National Cancer Institute — Lymphedema
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.
Keep reading
Related pages
Arm Exercises After MastectomyThe stretches that release the cord and keep the shoulder freeWhen Can You Lift Your Arm Fully Again?What a typical return of movement looks likeNumbness Under the Arm After MastectomyThe other common change under the arm, and why it is differentPreventing Lymphoedema After MastectomyArm swelling shares a cause with cording but is a different problemComplications and Red FlagsThe signs after any operation that need a call the same day
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Call the helpline or send us a message. A CION surgical team member will listen to what the arm is doing and tell you whether it needs a physiotherapy review or a surgeon's look. One helpline serves every centre.