A Renu therapist's hands working slowly across a client's upper back and shoulder while she rests face down on the treatment table

Radiation fibrosis after cancer treatment

Radiation fibrosis is slow scarring in treated tissue that can appear months or years later. Not reversible, but stiffness and pain are manageable.

By The Renu lymphatic and massage team · 6 min read

Radiation fibrosis is scarring that develops slowly in tissue that was inside a radiation field, sometimes months or years after treatment ends. It can stiffen skin, muscle and the connective tissue around nerves and lymph vessels, which is why a chest, armpit or neck that felt fine at the end of radiotherapy can later feel tight, hard or restricted. No treatment reverses the scarring itself, but its consequences, stiffness, reduced range of motion, swelling and pain, can be managed by a rehabilitation team, and gentle hands-on therapy has a place within that team.

What radiation fibrosis is

Radiation works by damaging cells, and healthy tissue inside the field is damaged alongside the tumour. A 2015 review in the Journal of Cancer Research and Clinical Oncology (Straub and colleagues) describes radiation-induced fibrosis as a long-term side effect of external beam radiotherapy that arises from a misguided wound-healing response: the radiation generates reactive oxygen and nitrogen species, local inflammation follows, and over time that inflammatory state evolves into a fibrotic one with increased collagen deposition, poor blood supply and scarring. Transforming growth factor beta is the primary chemical mediator.

When the scarring produces symptoms, clinicians call it radiation fibrosis syndrome. Dr Michael Stubblefield, a cancer rehabilitation physician, defines it as the multiple neuromuscular, musculoskeletal, visceral and other late effects that result from radiation-induced fibrosis. Radiation can injure the spinal cord, nerve roots, nerve plexus, peripheral nerves and muscles that lie within the field, producing what he terms a myelo-radiculo-plexo-neuro-myopathy, with pain, sensory loss and weakness as the result.

Cancer Research UK puts it more plainly: radiation fibrosis makes tissues less elastic, which in the breast can mean firmness or an altered shape, in the arms or legs swelling, in the throat difficulty swallowing from narrowing of the oesophagus, and in the lungs breathlessness.

Why it appears late, and keeps changing

Most acute radiation side effects settle within weeks. The Canadian Cancer Society notes that most side effects generally go away within a few weeks to two months of finishing treatment, but that late side effects can appear a long time after treatment finishes, and that some skin changes, such as darkening or scarring, can be permanent. Cancer Research UK says the same: some effects can continue or start some months or years later. Fibrosis sits in that second category.

The late effects on the skin include a darker colour in the treated area, altered texture, permanent sensitivity to the sun, and red spidery marks (telangiectasia) from broken small blood vessels. Underneath, the connective tissue can keep tightening. In one prospective study of 83 people treated for head and neck cancer, fibrosis was present in 42.2% before radiotherapy and in 66.7% to 77.4% at late follow-up, with more than half developing it within the first 18 months (Ridner and colleagues, 2016). The progressive nature is why the rehabilitation literature talks about managing the condition rather than finishing with it.

How it links to lymphedema

Radiation fields often include lymph nodes, and the scarring narrows the channels that drain the limb. Cancer Research UK describes the mechanism as drainage channels to the arms or legs becoming partly blocked, resulting in lymphoedema. The numbers bear it out: the National Cancer Institute’s physician-level summary cites a study in which 42% of women who had an axillary dissection plus radiation had lymphedema 18 months after surgery. If your tightness comes with heaviness or a change in the size of the arm, breast or neck, treat it as a possible lymphedema sign and ask for an assessment. Our pages on lymphedema risk after regional node radiation and head and neck lymphedema cover the specifics, and the NLN’s diagnosis statement notes that as lymphedema progresses, fibrosis is part of what makes the swelling harder and less pitting.

What a rehabilitation team can do

The honest summary from the 2020 review by DiFrancesco, Khanna and Stubblefield in Seminars in Oncology Nursing is that the syndrome cannot be undone, but supportive treatment of its consequences can potentially result in improved function and quality of life, and that early detection and supportive care by a multidisciplinary team improve the outcome. The team they describe includes oncology nurses, physical therapists, occupational therapists, speech pathologists and cancer rehabilitation specialists.

In practice that means:

a physiatrist or oncology rehabilitation physician to work out what is fibrosis, what is nerve injury and what is something else;
physiotherapy for range of motion, posture and strength, especially at the shoulder and neck;
speech-language pathology where swallowing or voice is affected;
lymphedema therapy where drainage is impaired;
skin care that respects permanently fragile skin.

Where gentle manual therapy and MLD fit

Hands-on work is part of the team approach, not a replacement for it. The NLN’s 2025 diagnosis and treatment statement notes that scars from surgery or radiation reduce lymph flow and call for techniques that soften tissue and improve drainage, that manual lymphatic drainage is applied directly to the skin with pressure adapted to tissue texture (firmer over fibrotic tissue, lighter over soft), and that therapists should avoid deep techniques in irradiated fields to prevent rib fractures or other vascular and skin complications. The National Cancer Institute’s skin guidance adds that heating pads, ice packs and bandages should not be used on a treatment area during radiotherapy, and that treated skin needs sun protection.

At Renu our Registered Massage Therapists and our Certified Lymphedema Therapist, Meeghan Mackenzie, work within those limits: slow, moderate work to tight tissue around a field, manual lymphatic drainage where swelling is part of the picture, no deep pressure over irradiated ribs or chest wall, no heat on treated skin, and sessions shaped by what your oncology or rehabilitation team has told you. Massage therapy and lymphatic drainage at Renu are adapted treatments; the goal is comfort, range and drainage, and we will say plainly when something belongs with a physician instead. If your firmness follows a liposuction rather than radiation, our page on fibrosis after liposuction is the right one.

When to call your oncology or rehabilitation team

Some symptoms in a radiated area are not a massage question. Contact your oncologist, radiation oncologist or physiatrist promptly for:

new weakness in the arm, hand or leg, or difficulty gripping or lifting;
new or spreading numbness, tingling or loss of sensation, which Cancer Research UK flags as possible nerve injury within a field;
new or worsening pain that is deep, constant or wakes you;
a new lump, thickening or skin change in or near the treated area;
new difficulty swallowing or breathing, or a change in voice, after neck or chest radiation;
skin that breaks down, weeps or will not heal;
rapid new swelling, redness, heat or fever, which may be infection or a clot rather than fibrosis.

Cancer Research UK’s advice is simple: talk to your doctor if you had radiotherapy in the past and are worried about side effects. Our when to seek medical care page lists the general red flags. Tightness that is slowly progressive and painless is still worth a conversation; the earlier a team sees it, the more there is to work with.

Questions people ask

Can massage break down radiation fibrosis?

No hands-on treatment has been shown to reverse the scarring. What manual therapy and lymphatic drainage can reasonably aim for is range of motion, comfort and drainage around the field, as one part of a rehabilitation team that includes physiotherapy and a cancer rehabilitation physician.

How long after radiotherapy can fibrosis start?

Months or years. Most acute side effects settle within a few weeks to two months, but late effects can appear long after treatment finishes and tend to progress. In one head and neck cohort, more than half of patients developed fibrosis within the first 18 months after treatment.

Is radiation fibrosis the same as lymphedema?

No, but they are linked. Fibrosis is scarring in the tissue; lymphedema is fluid that cannot drain. Radiation to lymph nodes can partly block drainage channels, and fibrosis and lymphedema often occur together in the same region, each stiffening the other.

Why does my radiated skin need to be treated differently?

Irradiated skin can stay darker, thinner, permanently sun-sensitive and marked by small broken vessels, and the ribs beneath a chest field are more fragile. The NLN advises against deep techniques in irradiated fields, and heat should not be used on treated skin.