Neck and arm pain can be challenging because similar symptoms may come from different mechanisms. Some patients have pain referred from cervical joints, discs, muscles, or ligaments. Others have pain related to irritation of a nerve root. Some have true radiculopathy, where nerve function is affected.

For therapists, the key is not simply to label the pain as “cervicobrachialgia” or “neck-related arm pain.” The goal is to identify the most likely pain mechanism, assess the level of concern, and decide whether physiotherapy management is appropriate or referral is needed.

Use the term spine-related arm pain

The term spine-related arm pain is useful because it encourages mechanism-based reasoning. It includes arm pain that is best explained by the spine or spinal nerves.

This can be divided into three broad categories:

1. Somatic-referred arm pain
2. Radicular pain without radiculopathy
3. Radicular pain with radiculopathy

These categories matter because they carry different implications for treatment, monitoring, prognosis, and safety.

Category 1: Somatic-referred arm pain

Somatic-referred arm pain comes from non-neural cervical structures, such as facet joints, ligaments, muscles, or the outer part of the disc.

The pain may travel into the arm, but it does not usually follow a clear dermatomal pattern. It is often more mechanical: symptoms increase with certain neck movements or postures and settle quickly when the position changes.

There are no objective neurological deficits. Strength, sensation, and reflexes should be normal.

In this group, physiotherapy management is usually appropriate. Treatment may include education, reassurance, movement, manual therapy, exercise, and advice on symptom modification.

Category 2: Radicular pain without radiculopathy

Radicular pain without radiculopathy suggests nerve root involvement, but without measurable loss of nerve function.

Patients may describe symptoms such as burning, tingling, pins and needles, electric shock-like pain, or unpleasant distal arm sensations. The pain may feel more intense in the arm than the neck. It may be less predictable and may take longer to settle after provocation.

However, the key point is that neurological testing remains normal. There is no objective dermatomal sensory loss, no myotomal weakness, and no reflex change.

This presentation may reflect nerve root irritation rather than nerve damage. Physiotherapy may still be appropriate, but the therapist should monitor carefully and repeat neurological testing if symptoms change.

Category 3: Radicular pain with radiculopathy

Radicular pain with radiculopathy means there is arm pain plus objective neurological deficit.

This may include:

Dermatomal sensory loss
Myotomal weakness
Reduced or absent reflexes

The practical difference between Category 2 and Category 3 is not simply whether the nerve is “irritated” or “compressed.” The key difference is whether the clinical examination shows impaired nerve function.

This is why neurological examination is essential.

Always perform a neurological examination

For any patient with neck-related arm pain, therapists should perform a neurological examination, even if the patient does not clearly report weakness or numbness.

This should include:

Sensation testing
Myotomal strength testing
Reflex testing

Neurodynamic tests, such as the upper limb neurodynamic test, can be useful, but they should not be used alone to decide whether radiculopathy is present. They can be positive in patients without radiculopathy and negative in some patients with confirmed radiculopathy.

The neurological examination is more important for detecting nerve dysfunction and deciding the level of concern.

Think in levels of concern

Not every radiculopathy needs emergency referral. The level of concern depends on the severity and progression of neurological findings.

Mild sensory disturbance without motor or reflex change may be managed with physiotherapy, provided there is close monitoring and clear safety-netting.

Rapidly worsening sensory loss, new weakness, or reflex change increases concern. These patients may need urgent medical review, especially if symptoms are progressing over a few days.

Severe motor weakness, multi-root involvement, anaesthesia, or rapidly progressive neurological deterioration requires emergency referral.

In simple terms:

Stable and mild = monitor carefully.
Progressive or worsening = urgent referral.
Severe or multi-root deficit = emergency referral.

Red flags are not a checklist

Red flags should not be used as isolated yes/no items. A single red flag rarely confirms or excludes serious pathology. Instead, therapists should use red flags as part of broader clinical reasoning.

Serious pathology is uncommon in primary care, but it must not be missed. Consider fracture, infection, malignancy, vascular pathology, inflammatory disease, or cervical myelopathy when symptoms or history suggest a higher level of concern.

The therapist’s job is to combine the subjective history, objective examination, neurological findings, and clinical judgement.

Reassess over time

Spine-related arm pain is not always static. A patient may initially present with somatic-referred pain and later develop neural features. A patient with radicular pain may improve, remain stable, or develop neurological deficit. Chronic cases may also involve nociplastic pain mechanisms.

This means the first diagnosis should be treated as a working hypothesis, not a permanent label.

Therapists should reassess symptoms, function, neurological signs, and response to treatment over time. Safety-netting is essential. Patients should know what changes require prompt review, such as increasing weakness, spreading numbness, worsening neurological symptoms, gait disturbance, bilateral symptoms, or bladder and bowel changes.

Key message for therapists

Spine-related arm pain requires structured reasoning. Similar pain maps can reflect very different mechanisms.

The therapist should first screen for serious pathology, then classify the likely pain mechanism, then perform a full neurological examination, and finally decide the level of concern.

The most important distinction is this:

Arm pain without objective neurological deficit may be suitable for conservative physiotherapy care.

Arm pain with neurological deficit requires closer monitoring.

Progressive or severe neurological deficit requires urgent or emergency referral.

A structured approach helps therapists manage uncertainty, communicate clearly, reduce risk, and provide safer, more mechanism-based care.