Persistent pain is common across almost every area of healthcare.

For GPs, physiotherapists, surgeons and other clinicians, it is not always obvious when referral to a pain specialist will add something useful. Equally, referral to pain medicine is sometimes made because symptoms have persisted and it is unclear where else the patient should go.

Pain medicine can offer a great deal, but it cannot replace appropriate investigation or specialist diagnosis.

A useful starting question is therefore not simply:

“Has this patient had pain for long enough to warrant a pain referral?”

but:

“What am I hoping a pain specialist will help us with?”

When the diagnosis or pain mechanism remains unclear

One of the most useful roles of a pain consultation can be helping to understand what kind of pain the patient is experiencing.

Persistent pain often does not fit neatly into a single category.

There may be nociceptive, neuropathic and nociplastic components. Structural pathology may be present but insufficient to explain the whole presentation. Imaging and symptoms may appear discordant. Several potential pain generators may coexist.

In these circumstances, specialist assessment can help develop a clinical formulation and identify which elements might realistically be amenable to treatment.

This does not always result in a new diagnosis.

Sometimes the useful outcome is simply a much clearer understanding of the existing one.

When sensible first-line treatment isn't enough

Referral may be helpful when pain continues to have a significant impact despite appropriate initial management.

That might include physiotherapy or rehabilitation, simple analgesia, appropriate neuropathic pain medication, self-management strategies or treatment of the underlying condition.

The purpose of referral is not necessarily to escalate treatment.

Sometimes it is to reconsider it.

A patient taking increasing amounts of medication with little meaningful improvement, for example, may benefit more from rationalisation than from another prescription.

When pain is preventing rehabilitation

There are situations where the underlying management plan is clear, but pain makes it difficult to implement.

A patient may understand the importance of movement and rehabilitation but be unable to progress because symptoms repeatedly overwhelm their efforts.

Pain specialist input may sometimes help create a window for rehabilitation, whether through medication optimisation, a targeted intervention or simply a different approach to symptom management.

This works best when the pain clinician and rehabilitation practitioner communicate with one another.

When you're wondering whether an intervention might help

A referral does not need to request a particular procedure.

Indeed, “Would an intervention have a useful role here?” is often a better question than “Please perform an epidural/facet injection/denervation.”

The decision to intervene depends on the clinical presentation, likely pain mechanism, imaging where relevant, previous treatment and what the patient hopes to achieve.

Sometimes the answer will be an injection or radiofrequency treatment.

Sometimes the assessment will suggest that an intervention is unlikely to help.

Both are useful outcomes.

When several problems appear to coexist

Pain becomes particularly difficult when several plausible contributors accumulate.

A patient may have osteoarthritis, degenerative spinal changes, previous surgery, neuropathic symptoms, poor sleep and increasingly widespread sensitivity.

Trying to identify the one thing causing the pain may no longer be productive.

Pain medicine can help bring those elements together into a formulation and determine which are potentially modifiable.

This can be particularly useful for patients who have accumulated multiple investigations and specialist opinions but still do not understand why they hurt or what they should do next.

When you simply aren't sure what to do next

This is a perfectly reasonable reason to seek advice.

Clinicians sometimes hesitate to refer without a specific procedural request or clearly defined diagnosis.

Neither is essential.

A referral explaining:

“This patient continues to struggle with pain despite appropriate treatment and I am uncertain what would be useful next”

can be entirely appropriate.

Sometimes another pair of eyes is exactly what is needed.

When might pain medicine NOT be the right referral?

This is equally important.

A pain clinic is principally concerned with the assessment and management of pain. It should not replace investigation of an undiagnosed condition requiring assessment by another specialty.

When the patient is awaiting an important specialist diagnosis

If the predominant problem is still being investigated by an appropriate specialty, completing that assessment may need to come first.

For example, a patient awaiting rheumatological assessment for suspected inflammatory disease, neurological investigation of progressive neurological symptoms, or orthopaedic assessment of significant structural pathology does not necessarily benefit from being diverted into a pain pathway before that diagnostic process is complete.

Pain management can sometimes occur alongside specialist investigation, particularly where symptoms are severe.

But it should not become a substitute for obtaining the diagnosis the patient actually needs.

When there are red flags or progressive symptoms

New or progressive neurological deficit, suspected cauda equina syndrome, infection, malignancy, fracture or other potentially serious pathology requires appropriate urgent investigation rather than routine pain referral.

Similarly, significant unexplained systemic symptoms should prompt investigation of their underlying cause.

Persistent pain does not automatically mean chronic primary pain.

When definitive treatment of the underlying condition is required

Sometimes the source of pain is reasonably clear and another specialty is better placed to address it.

Severe hip osteoarthritis requiring consideration of joint replacement, symptomatic gallstone disease, active inflammatory arthritis or a surgically remediable compressive lesion are not primarily pain-management problems.

A pain specialist may occasionally have a useful supporting role — for example, where definitive treatment is delayed or contraindicated — but treating pain should not inadvertently delay treatment of its cause.

When the referral is primarily for diagnosis outside pain medicine

Pain specialists are accustomed to diagnostic uncertainty, but our expertise has boundaries.

A referral asking a pain clinician to diagnose an unexplained neurological disorder, rheumatological condition or visceral pathology is unlikely to be the most efficient route.

Where the clinical question belongs clearly to another specialty, that specialty should usually assess the patient first.

Once the underlying condition has been characterised, pain medicine may then have a valuable role in managing persistent symptoms.

When the patient has not yet had appropriate initial management

Not every patient with persistent musculoskeletal pain needs specialist pain assessment.

Many people can be managed effectively through primary care, physiotherapy, appropriate medication, supported activity and self-management.

Specialist referral becomes more useful when there is a particular clinical question, significant complexity, failure to progress or a need for treatment that cannot reasonably be provided in the existing setting.

Pain medicine does not have to be the end of the pathway

Historically, patients have sometimes reached pain services after every other specialty has effectively said “there is nothing more we can do.”

That is not necessarily the most useful way to think about pain medicine.

Earlier input can sometimes prevent repeated investigations, escalating medication or inappropriate procedures.

But neither should pain medicine become the default destination whenever diagnosis is difficult.

The timing of referral matters.

Sometimes the right answer is:

“Yes, I think a pain assessment could help now.”

Sometimes it is:

“Let's complete the specialist investigation first, and if pain remains a significant problem afterwards, we can address it properly then.”

What makes a helpful referral?

A lengthy referral is not necessary.

It is particularly useful to know:

• the predominant pain problem and its duration;

• relevant diagnoses and investigations;

• treatments already attempted and their effects;

• other specialist assessments underway or planned;

• the impact of pain on function;

• and, importantly, what help is being requested.

That final point can be as simple as:

“I would value your opinion about what is driving this patient's persistent pain and what we might reasonably do next.”

That is often enough.

The right patient, at the right point

Pain medicine can offer diagnostic clarification, medication review, interventional treatment, rehabilitation support and a broader formulation of complex persistent pain.

But good pain medicine also involves recognising when another clinical question needs answering first.

The aim should not be to collect patients simply because they have pain.

It should be to see them when pain specialist expertise is likely to change something useful.

For clinicians

Wye Sanctuary welcomes referrals and self-referrals for persistent and complex pain, including cases where the predominant pain mechanism is uncertain, symptoms and imaging appear discordant, treatment has stalled or advice is required regarding interventional management.

We are also happy to advise when there is uncertainty about whether pain specialist assessment is appropriate. Where another specialist diagnosis or investigation should reasonably come first, we will aim to identify this rather than unnecessarily medicalising or intervening in the pain.

This article is intended for general professional education and does not replace individual clinical assessment, urgent referral pathways or applicable local and national guidance.