What really happens to lymphatic drainage after breast cancer treatment?

October is Breast Cancer Awareness Month.

There will quite rightly be plenty of conversations about checking breasts, knowing what is normal for you, diagnosis, surgery, chemotherapy, radiotherapy and reconstruction.

But I want to take us slightly further down the road.

Because after breast cancer treatment, particularly when lymph nodes have been removed or treated, I think people deserve to understand something else:

First, where does lymph from the breast normally go?

We often talk about “the lymph nodes under the arm” as though there is one pipe running from the breast directly into the axilla.

There isn’t.

The lymphatic system is a network.

A significant proportion of lymph from the breast does travel towards lymph nodes in the axilla — the armpit.

But lymphatic drainage is more complex than one destination.

There are also pathways towards the parasternal/internal mammary nodes, positioned closer to the breastbone, together with connections through superficial and deeper lymphatic networks.

And, importantly, bodies vary.

Your lymphatic anatomy won’t necessarily look exactly like the diagram in a textbook.

That becomes important when we begin thinking about what happens after treatment.

Then breast cancer treatment changes the landscape

Depending on the cancer and treatment plan, someone may have:

• a sentinel lymph node biopsy

• removal of several lymph nodes

• an axillary lymph node dissection

• breast-conserving surgery

• mastectomy

• reconstruction

• radiotherapy

• chemotherapy

• combinations of several of these.

Each potentially changes the environment through which lymph has to move.

A sentinel node biopsy is obviously very different from a full axillary dissection.

Radiotherapy can also affect tissue quality and lymphatic transport.

Scars alter the physical landscape.

Surgery can interrupt vessels.

Inflammation temporarily increases fluid load.

Movement may initially reduce because an arm or chest is sore.

The important point is that this isn’t simply:

“Nodes removed = lymph cannot move.”

It is more nuanced than that.

Think load versus capacity

One of the easiest ways of understanding lymphoedema is to think about the relationship between load and transport capacity.

Your tissues constantly produce fluid that needs to be returned to the circulation.

The lymphatic system has a certain capacity to deal with that fluid and everything transported within it.

Following breast cancer treatment, that transport capacity may be reduced.

You may therefore have:

🐇 Follow me down the first rabbit hole…

If lymph nodes are removed, does the body create another route?

This is where things become fascinating.

The lymphatic system has some ability to adapt.

Existing vessels may take on more work.

Connections between territories may become more important.

Collateral pathways may develop or become more functionally significant.

Fluid may be redirected towards alternative drainage territories.

But — and this matters — we cannot assume the alternative route is the same for everybody.

One person’s system may compensate extremely well.

Another’s may compensate differently.

Another may remain vulnerable for years.

So when someone says:

“My lymph nodes were removed ten years ago and I’ve never had a problem.”

that is reassuring for that person.

It does not automatically tell us what will happen in somebody else’s body.

Fi Thought 💭

This is why I struggle a little with language suggesting that the lymphatic system has simply been “blocked”.

Sometimes there may indeed be significant obstruction.

But after cancer treatment we are often looking at a changed transport network.

A road may have disappeared.

Another may be narrower.

Traffic may be rerouting.

A previously quiet side road may suddenly become rather important.

I find that a much more useful way of thinking about rehabilitation than imagining a sink with a blocked plughole.

Does everyone who has lymph nodes removed develop lymphoedema?

No.

And this is incredibly important.

Node surgery increases risk, but it does not make lymphoedema inevitable.

Risk differs according to treatment and individual factors.

More extensive axillary surgery generally carries a greater risk than sentinel node biopsy.

Radiotherapy to regional lymphatic areas can add to that risk.

Other factors — including infection, body composition, tissue health and the individual’s underlying lymphatic anatomy — may also contribute.

But risk is not destiny.

And I think that is a much more empowering conversation.

🐇 Rabbit hole number two: Can we spot problems before obvious swelling appears?

Increasingly, this is where lymphoedema management is heading.

Historically, someone might only be referred once an arm was visibly swollen.

But changes in tissue fluid can potentially occur before a person or clinician can see a substantial difference.

This is why approaches such as prospective surveillance have become so interesting.

Measurements can be taken before or around treatment and then followed over time.

Methods may include:

• limb measurements

• volume measurements

• bioimpedance spectroscopy (BIS)

• clinical assessment

• and, perhaps most importantly, listening carefully to what the person is noticing.

Because people often notice something before anyone can see very much.

The quieter whispers

Early changes aren’t always dramatic.

Someone might say:

“My sleeve feels tighter.”

“My watch is leaving a mark.”

“My arm feels heavy.”

“My breast feels fuller by the evening.”

“My hand feels puffy.”

“Something just feels different.”

Those statements matter.

Not because every sensation means lymphoedema. It doesn’t.

But because noticing change gives us an opportunity to assess rather than simply wait for a large visible problem.

Don’t lift. Don’t carry. Don’t overuse the arm. Be careful. Protect it.

And of course immediately after surgery, tissue needs appropriate time to heal.

But long-term avoidance is not the same thing as sensible recovery.

We now have a substantial body of evidence showing that appropriately prescribed, gradually progressed exercise — including resistance training — is generally safe for people at risk of breast-cancer-related lymphoedema and for many people already living with it.

That doesn’t mean:

“Go and lift as much as you can tomorrow.”

It means:

Start where you are. Progress from there.

Muscle contraction assists movement of fluid through tissues.

Breathing changes pressure through the thorax and abdomen.

Joint movement changes local tissue pressures.

Strength improves what the arm can tolerate.

And confidence in using the body matters enormously.

Fi Thought 💭

Sometimes our desire to keep somebody safe accidentally teaches them to be frightened of their own body.

There is a difference between:

“Your lymphatic system has changed, so let’s understand it and progressively build what you can do.”

and:

“You must protect this arm forever.”

For me, rehabilitation should move us towards the first conversation.

What about scars?

Scars are another part of the road map.

After breast surgery there may be scars from lumpectomy, mastectomy, axillary surgery, reconstruction or donor sites.

A scar is not simply something sitting on top of the skin.

Healing involves layers of tissue.

Some people develop excellent mobility very quickly.

Others experience restriction, pulling, altered sensation or discomfort.

That can affect shoulder movement, chest-wall movement, breathing patterns and how confidently somebody uses their arm.

So scar rehabilitation may form part of the bigger picture.

Not because we need to aggressively “break down” every scar.

But because movement, tissue mobility, strength, sensation and function all matter.

🐇 Rabbit hole number three: What about manual lymphatic drainage?

This is where I think we need a grown-up conversation.

Manual lymphatic drainage — MLD — is one tool within lymphoedema management.

For some people it can be extremely useful.

But it isn’t magic.

And it isn’t simply about pushing fluid towards the nearest armpit.

Good lymphatic treatment requires us to think about the individual person’s anatomy, treatment history, tissue presentation and available drainage pathways.

After breast cancer surgery, especially where lymph nodes have been removed or treated, the original route may not function in exactly the way it once did.

That is why clinical reasoning matters.

Where are we trying to encourage fluid to go?

What territory appears available?

How has surgery changed the landscape?

Is there fibrosis?

What is happening around scars?

What does the person’s swelling pattern tell us?

What changes with movement?

And what can that person do themselves between appointments?

MLD should never exist in isolation from the bigger rehabilitation picture.

Drainage makes us ask: where is it going — and is that route actually working?

That becomes particularly important after surgery when the original anatomical pathways may have been changed.

🐇 Rabbit hole number four: Do we always need to remove lots of lymph nodes?

Breast cancer surgery is changing too.

The role of axillary surgery has become increasingly selective.

Sentinel lymph node biopsy already allows many people to avoid a full axillary dissection.

And ongoing research continues to examine whether some people can safely undergo less axillary surgery without compromising cancer outcomes.

One example is the INSEMA trial, which has investigated whether sentinel lymph node surgery itself can sometimes be omitted in selected patients undergoing breast-conserving treatment.

This does not mean lymph node surgery is unnecessary.

It means treatment continues to evolve as oncology tries to balance excellent cancer control with reducing long-term treatment consequences where safely possible.

And from a rehabilitation point of view, that matters.

Because every improvement that safely preserves more normal anatomy potentially changes somebody’s long-term functional landscape.

What I would love breast cancer rehabilitation to look like

Imagine this.

Before surgery, someone understands:

• what treatment may do to their shoulder and chest

• how their lymphatic system works

• what lymphoedema actually is

• what changes to notice

• and why movement matters.

After surgery they receive appropriate guidance to restore:

• shoulder range

• chest-wall mobility

• breathing

• general activity

• confidence.

Then we progressively rebuild:

• strength

• cardiovascular fitness

• function

• and the ability to get back to life.

Alongside that, people at higher risk of lymphoedema could have sensible surveillance.

And if something begins to change, intervention happens early, rather than waiting until the arm is significantly swollen.

To me, that is rehabilitation.

Not simply treating the aftermath.

Fi Thought 💭

I sometimes wonder whether we have spent so much time telling people how to avoid lymphoedema that we haven’t spent enough time teaching them how to build a body that is capable, strong and confident after cancer treatment.

Precautions have a place.

Awareness matters.

But so does living.

Someone who has had breast cancer surgery still needs to:

carry shopping.

pick up grandchildren.

garden.

work.

exercise.

travel.

sleep comfortably.

put a suitcase in the car.

reach into a cupboard.

and occasionally do something completely ordinary without thinking about cancer.

That is surely part of the goal too.

So what should you actually remember?

If you’ve had breast cancer treatment involving your breast, chest or lymph nodes:

Understand it.

Know that your lymphatic anatomy may have changed.

Move it.

Movement is part of recovery, not something to fear indefinitely.

Strengthen it.

Build gradually and progressively.

Follow me down the rabbit hole — further reading 🐇

If you fancy disappearing a little further into the evidence, useful areas to explore include:

Breast-cancer-related lymphoedema risk and surveillance

Research around prospective surveillance models, including early detection using limb measurements and bioimpedance spectroscopy, is changing the conversation from waiting for obvious swelling towards identifying changes earlier.

The PREVENT trial is particularly interesting in relation to BIS-guided surveillance and early intervention.

Progressive resistance exercise

Work including the PAL trial helped challenge the long-standing fear that women at risk of breast-cancer-related lymphoedema should avoid lifting weights.

The broader research literature now supports appropriately progressed resistance exercise rather than blanket restriction.

Axillary surgery

Research including ACOSOG Z0011, AMAROS, SOUND and more recently INSEMA forms part of the continuing evolution towards more selective management of the axilla for appropriate patients.

These studies apply to defined patient groups and should never be interpreted as meaning lymph-node assessment is no longer important.

Lymphatic anatomy and rerouting

Modern lymphatic imaging, including indocyanine green lymphography and lymphoscintigraphy, continues to improve understanding of individual lymphatic pathways, dermal backflow and collateral drainage.

And perhaps reinforces something rather important:

The textbook picture is a useful starting point. It is not everybody’s personal road map.

Reading list

For readers who want to explore further, areas and papers worth looking at include:

• Schmitz KH and colleagues — progressive weight lifting and breast-cancer-related lymphoedema.

• The Physical Activity and Lymphedema (PAL) trial.

• Ridner SH and colleagues — prospective surveillance and bioimpedance spectroscopy.

• The PREVENT trial — BIS versus tape measurement surveillance and early intervention.

• Giuliano AE and colleagues — ACOSOG Z0011 and axillary management.

• Donker M and colleagues — AMAROS trial.

• Gentilini OD and colleagues — SOUND trial.

• Reimer T and colleagues — INSEMA trial.

• International Society of Lymphology consensus documents on peripheral lymphoedema.

• British Lymphology Society guidance and resources relating to lymphoedema and cancer treatment.

A final note

This article is intended to help people understand the principles behind breast-cancer-related lymphatic change.

It cannot tell you what route your lymphatic system is using, diagnose lymphoedema or replace individual oncology or lymphoedema assessment.

If you have new or persistent swelling, redness, heat, pain, sudden change or feel unwell, seek appropriate medical advice.

But if your question is:

“My lymph nodes have been removed — does that mean my lymphatic system can no longer work?”

the answer is much more interesting than a simple yes or no.

Your body may have a different road map now.

And understanding that map is part of learning how to move forward.

Need some help understanding your changing road map?

If breast cancer treatment has left you with questions about swelling, heaviness, scars, movement, strength or lymphoedema risk, you don’t have to wait until something becomes a big problem before asking for advice.

I work with people following cancer treatment using lymphoedema assessment and management, manual lymphatic drainage, scar therapy, movement and progressive rehabilitation — always looking at the whole person rather than one isolated symptom.

Treatment may have changed the map. The next step is understanding the body you have now.

To find out more or book an appointment, visit pilatestherapyandbodywork.com.