Most patients expect pain after surgery.

They are usually also reassured that it will improve as tissues heal and recovery progresses. For most people, that is exactly what happens.

For a significant minority, however, pain persists beyond the expected period of recovery. Sometimes it resembles the original postoperative pain. Sometimes it changes character, becoming burning, shooting, hypersensitive or difficult to reconcile with the apparent healing of the surgical site.

Persistent post-surgical pain can be distressing for patients and challenging for clinicians.

The first task is not simply to treat the pain.

It is to understand why recovery has not followed the expected trajectory.

What is persistent post-surgical pain?

Persistent post-surgical pain is generally understood as pain that develops or increases following surgery and continues beyond the normal healing period, usually for at least three months.

The pain should be localised to the surgical area or a relevant area of referral and should not be better explained by another cause, including recurrence or persistence of the condition for which surgery was performed.

That last point matters.

Pain after surgery is not automatically post-surgical pain.

Before applying the label, we need to consider whether there is an ongoing surgical, structural or disease-related explanation.

Start by asking whether something has gone wrong

When pain persists after an operation, there can be a temptation to move quickly towards chronic pain management.

Sometimes that is appropriate.

Sometimes it is too early.

Depending on the operation and presentation, persistent or increasing pain may indicate infection, mechanical failure, non-union, recurrent disease, instability or another surgical complication.

New neurological symptoms may require further investigation.

The appropriate surgical team should therefore remain involved where there is reasonable concern about the operative outcome.

Pain medicine should not become a substitute for appropriate surgical reassessment.

But a technically successful operation can still result in pain

The converse is equally important.

Some patients continue to experience significant pain despite satisfactory healing and an apparently successful surgical outcome.

This can be confusing and frightening.

Patients may reasonably ask:

“If the operation has healed properly, why does it still hurt?”

There are several possible answers.

Surgery necessarily involves tissue injury. Skin, muscle, fascia and sometimes bone are divided, retracted or manipulated. Small peripheral nerves may be injured. Larger nerves may occasionally be affected. Scar tissue develops and movement patterns change during recovery.

For most people these processes settle.

For some, they leave a persistent pain problem.

Look for a neuropathic component

Neuropathic pain is particularly important to recognise after surgery.

Patients may describe burning, shooting, electric-shock sensations, numbness, tingling or marked sensitivity around a scar.

Light touch from clothing may become unpleasant. A previously numb area may become painful. Examination may reveal altered sensation, allodynia or hyperalgesia.

The distribution does not always correspond neatly to a major named nerve.

Small cutaneous nerve branches can be injured during surgery, producing very focal but troublesome symptoms.

Recognising a neuropathic component matters because simply escalating conventional analgesia may offer little benefit.

The scar itself may be relevant

Painful scars deserve examination.

A patient may have a discrete area of tenderness, tethering, altered sensation or a particularly sensitive point within or adjacent to the scar.

Occasionally there may be features suggesting a neuroma or entrapment of a small peripheral nerve.

This is easily missed if persistent postoperative pain is assessed only through imaging.

A scan can tell us a great deal about deeper anatomy.

It cannot tell us whether touching one centimetre of a scar reliably reproduces the patient's pain.

Clinical examination still matters.

Not all persistent pain is neuropathic

Musculoskeletal pain may also persist after surgery.

Patients can develop altered biomechanics, protective muscle guarding, reduced strength and deconditioning during prolonged recovery.

An operation may successfully treat one pathology while another source of pain remains.

And occasionally the original diagnosis was only part of the explanation for the patient's symptoms.

This is particularly relevant after spinal and orthopaedic procedures.

Persistent pain does not necessarily mean that the operation failed.

Nor does a technically successful operation mean that every subsequent pain must arise from sensitisation.

Again, several mechanisms can coexist.

Acute postoperative pain matters

Severe acute postoperative pain is associated with an increased risk of persistent pain.

This does not mean that every episode of severe postoperative pain will become chronic, or that persistent pain represents a failure of perioperative analgesia.

The relationship is more complex.

Pre-existing pain, the type of surgery, nerve injury, psychological and social factors, individual pain sensitivity and the intensity and duration of acute postoperative pain may all contribute.

It does, however, reinforce the importance of taking acute pain seriously.

Good perioperative analgesia is not simply about making the first few postoperative days more comfortable. It supports breathing, mobilisation, sleep, rehabilitation and recovery.

When does normal recovery become persistent pain?

There is rarely a single moment when acute postoperative pain becomes chronic.

Recovery is a trajectory.

A patient whose pain is gradually improving at eight weeks may need reassurance and continued rehabilitation.

Someone whose pain is escalating, changing character or significantly limiting recovery may require reassessment much sooner.

Rather than relying entirely on an arbitrary time threshold, it can be useful to ask:

Is this patient progressing in the way we would reasonably expect following this operation?

If the answer is no, understanding why may be more useful than simply waiting for three months to pass.

What can pain medicine offer?

The answer depends on the mechanism.

For some patients, medication directed towards neuropathic pain may be appropriate.

For others, a focal nerve block, scar infiltration or other targeted intervention may help clarify the source of pain or provide symptom relief.

Where a specific peripheral nerve appears involved, further specialist assessment may sometimes be warranted.

But procedures are only one part of the picture.

Persistent pain may have interrupted physiotherapy, sleep, work and normal activity. Patients can understandably become frightened of movement or of damaging the surgical repair.

Helping somebody resume rehabilitation and regain confidence can therefore be just as important as reducing the pain itself.

The role of diagnostic injections

Targeted local anaesthetic injections can occasionally be particularly informative in focal post-surgical pain.

If a patient's characteristic pain temporarily disappears following blockade of a suspected peripheral nerve or infiltration of a very specific painful area, that can help refine the clinical formulation.

But diagnostic blocks are not perfect tests.

Responses need to be interpreted alongside the history and examination rather than treated as definitive proof of a diagnosis.

The purpose is to add information, not simply to create another procedure pathway.

When pain becomes more widespread

For some patients, pain gradually extends beyond the original surgical area.

Sensitivity increases. Sleep deteriorates. Activity becomes difficult and recurrent flares develop.

At this stage, altered pain processing may be contributing alongside the original peripheral source.

This does not mean that the initial surgical pain was imaginary or that the peripheral pathology no longer matters.

It means that the clinical problem has become more complex.

Continuing to treat only the original surgical site may then produce diminishing returns.

Language matters here too

Persistent pain following surgery can be particularly difficult psychologically.

Patients may have undergone an operation believing it would remove their pain, only to find themselves facing a different or sometimes worse problem.

They may worry that something has been damaged or that the operation has failed.

Occasionally they have been told that “everything looks fine” and conclude that nobody believes their symptoms.

It is possible to communicate both messages:

The surgical result appears satisfactory.

and:

Your ongoing pain is real and deserves assessment.

Those statements are not contradictory.

Prevention and early recognition

Not every case of persistent post-surgical pain can be prevented.

But recognising patients who are struggling with recovery gives us an opportunity to intervene earlier.

That might mean better analgesia, identifying neuropathic symptoms, addressing sleep, supporting rehabilitation, treating a focal pain generator or simply providing an explanation that reduces fear and uncertainty.

The objective is not to medicalise every slow recovery.

It is to recognise when the trajectory has genuinely changed.

Bringing the pieces together

Persistent pain after surgery is not a single diagnosis with a single treatment.

The first question should be whether there is an ongoing surgical or disease-related problem requiring investigation.

Once that has been appropriately considered, assessment can focus on the mechanisms maintaining the pain.

There may be peripheral nerve injury.

There may be a painful scar.

There may be persistent nociceptive or musculoskeletal pain.

There may be altered pain processing.

Often there is more than one contributor.

The useful question is therefore not simply:

“Why does this operation still hurt?”

but:

“What is generating and maintaining this person's pain now — and which parts of that can we usefully change?”

For clinicians

Wye Sanctuary welcomes referrals and self-referrals for persistent pain following surgery, particularly where pain is interfering with rehabilitation, neuropathic features are present, the surgical outcome does not fully explain the symptoms or advice is required regarding a possible focal intervention.

Where an unresolved surgical complication or other specialist diagnosis remains a concern, appropriate investigation and review should take priority or proceed alongside pain management.

We are happy to work collaboratively with the patient's surgeon, GP, physiotherapist and other treating clinicians where appropriate.

This article is intended for general professional education and does not replace individual clinical assessment or applicable clinical guidance.