Cervical Radiculopathy: When Neck Pain Travels Down the Arm

The cervical spine has eight nerve roots (C1 through C8) that exit through openings called neural foramina on each side of the vertebral column. Each nerve root supplies specific muscles and skin areas in the shoulder, arm and hand. When one of these roots is compressed or inflamed, the result is cervical radiculopathy: pain, tingling, numbness or weakness that follows the distribution of that specific nerve root, from the neck down into the arm.

The most common levels are C5-C6 and C6-C7, which together account for the majority of cases [1]. The incidence is highest in the 50 to 54 age group. Men are affected slightly more often than women. The anatomy explains why these levels predominate: C5-C6 and C6-C7 are the most mobile segments of the cervical spine, and the segments that bear the most mechanical load during flexion and extension. More motion and more load means more wear, more disk degeneration, and more opportunity for nerve root compression.

What Is Happening

Nerve root compression in the cervical spine occurs through two main mechanisms:

Disk herniation. The intervertebral disk has a gel-like center (nucleus pulposus) surrounded by a fibrous ring (annulus fibrosus). When the annulus weakens or tears, the nucleus can protrude into the neural foramen and press on the exiting nerve root. This tends to occur in younger patients (30s to 50s) and often has a more acute onset. The herniated material not only compresses the nerve mechanically but also produces a chemical inflammatory response: substances from the nucleus pulposus are irritating to neural tissue, which is why even a small herniation can produce significant pain.

Foraminal stenosis. Degenerative changes, including disk space narrowing, facet joint hypertrophy and bone spur formation (osteophytes), gradually narrow the neural foramen. This tends to occur in older patients and has a more gradual onset. The stenosis worsens with neck extension and rotation toward the affected side, both of which further narrow the foramen, and this is diagnostically useful: if turning the head toward the painful arm and looking up reproduces the arm symptoms (the Spurling test), it supports the diagnosis of foraminal nerve root compression.

The critical context, as with most spinal imaging findings, is prevalence in asymptomatic people. Cervical disk herniations are found on MRI in 20 to 30 percent of asymptomatic adults over 40 [5]. A disk bulge on MRI does not, by itself, mean the disk is causing the symptoms. The clinical correlation, whether the patient’s symptoms match the level and side of the finding, matters more than the image. An MRI showing a C6-C7 disk herniation on the right in a patient with left-sided C5 symptoms is not an explanation; it is incidental.

Each nerve root level produces a recognizable pattern:

• C5: Pain and weakness in the deltoid and biceps. Sensory change over the lateral arm. The biceps reflex may be diminished.
• C6: Pain and weakness in the biceps and wrist extensors. Sensory change in the thumb and index finger. The brachioradialis reflex may be diminished.
• C7: Pain and weakness in the triceps and wrist flexors. Sensory change in the middle finger. The triceps reflex may be diminished.
• C8: Pain and weakness in the hand intrinsics. Sensory change in the ring and little finger. Grip strength may be reduced.

These patterns are not absolute (overlap between nerve root territories is common), but they provide a useful framework for localizing the problem before imaging.

What the Evidence Supports

The natural history of cervical radiculopathy is generally favorable. Studies report that 75 to 90 percent of patients improve within 2 to 3 months with conservative management [6]. Many disk herniations shrink or resorb over time. The nerve root inflammation resolves as the herniated material is reabsorbed, and even when the herniation persists, the nerve can adapt to a degree.

Conservative management includes [3], [4]:

• Exercise and physical therapy. Cervical traction, neural mobilization, deep neck flexor training and cervicoscapular strengthening. A randomized trial found that physiotherapy produced outcomes comparable to surgery at one year for patients without progressive neurological deficit [2]. Deep neck flexor training is particularly relevant because these muscles stabilize the cervical segments and reduce the excessive segmental motion that contributes to nerve root irritation.
• Cervical epidural steroid injection. Can provide short-term pain relief (weeks to months), which may facilitate participation in rehabilitation. The evidence supports its use as a bridge to functional recovery, not as a definitive treatment.
• Oral medications. NSAIDs for pain; short courses of oral steroids are sometimes used for severe radicular pain, though the evidence base is limited. Neuropathic pain medications (gabapentin, pregabalin) may help when the pain has a strong burning or electric quality, though the evidence in cervical radiculopathy specifically is extrapolated from other neuropathic pain conditions.

Surgery (anterior cervical discectomy and fusion or disk replacement) is considered when:

• Conservative management has not improved symptoms after 6 to 12 weeks
• There is progressive motor weakness
• There are signs of cervical myelopathy (spinal cord compression)

The surgical evidence for cervical radiculopathy is not as clearcut as patients often expect. Surgery reliably produces faster improvement in the short term, but multiple studies show that conservative management catches up at one to two years for most patients without progressive neurological deficit [2]. The exception is patients with significant or worsening weakness, where waiting risks permanent motor loss.

Cervical Myelopathy: The Important Distinction

Cervical myelopathy occurs when the spinal cord itself, not just a nerve root, is compressed. This is a different and more serious condition. The key distinguishing features are:

• Bilateral symptoms (both arms, or arms and legs)
• Difficulty with fine motor coordination in the hands (dropping objects, difficulty with buttons)
• Gait disturbance (legs feel stiff or clumsy)
• Bladder or bowel changes

These symptoms require urgent specialist evaluation. Cervical myelopathy does not resolve spontaneously and can progress if untreated. The distinction between radiculopathy (nerve root) and myelopathy (spinal cord) is one of the most important differentiations in neck and arm pain. Radiculopathy is common, usually self-limiting, and managed conservatively. Myelopathy is uncommon, progressive without treatment, and typically requires surgical decompression.

Exercises to Try

These are for radiculopathy without myelopathy signs. If exercises increase arm pain or neurological symptoms, stop and consult a clinician.

Chin tuck. Sit upright. Draw the chin straight back (retraction), creating a “double chin.” The movement is horizontal, not downward. Hold for 5 seconds. This opens the neural foramina and reduces compression by straightening the cervical lordosis and increasing the space where the nerve roots exit. 10 repetitions, three to four times daily. Many patients find this position relieves arm symptoms, which is both therapeutic and diagnostically encouraging.

Cervical retraction with extension. Perform a chin tuck, then gently extend the neck (look up slightly) while maintaining the tuck. Hold for 3 seconds. This is a McKenzie-based approach that can centralize arm pain (move it closer to the neck, which is a good prognostic sign). 10 repetitions. Stop if arm symptoms increase. Centralization, where the arm symptoms retreat toward the neck with the exercise, generally predicts a good outcome with conservative management.

Deep neck flexor activation. Lie on your back with the neck in a neutral position. Perform a gentle chin tuck (nod) while keeping the back of the head on the surface. The movement is small, like nodding “yes” by a centimeter. Hold for 10 seconds. 10 repetitions. This activates the deep cervical flexors (longus colli and longus capitis), which stabilize the cervical segments from the front. These muscles are typically inhibited in patients with neck pain, and their weakness allows excessive segmental motion that contributes to nerve root irritation.

Neural glide (median nerve). Stand with the affected arm out to the side at shoulder height, palm up. Gently extend the wrist (fingers pointing toward the floor) while side-bending the neck away from the arm. Then flex the wrist while side-bending toward the arm. Alternate slowly. 10 repetitions. This should produce a gentle stretch along the arm, not sharp pain. The purpose is to maintain the nerve’s ability to glide through its surrounding tissues; a compressed nerve can develop tethering at the site of compression, and gentle mobilization reduces this.

Scapular retraction. Sit or stand upright. Squeeze the shoulder blades together and slightly down, as if putting them into your back pockets. Hold for 5 seconds. 15 repetitions. This strengthens the middle and lower trapezius and rhomboids, which support an upright posture and reduce the forward head position that narrows the neural foramina.

When to See a Doctor

See a doctor urgently if:

• There is progressive weakness in the arm or hand
• There is loss of hand coordination or difficulty with fine motor tasks
• There are bilateral arm symptoms or leg symptoms (may indicate cervical myelopathy)
• There are bladder or bowel changes
• Pain follows significant trauma (possible fracture or ligament injury)

See a doctor soon if:

• Arm pain has not improved after 6 weeks of conservative management
• There is measurable weakness in specific muscle groups
• Pain is severe enough to prevent sleep or daily activities

When to see a doctor. If joint pain follows a significant injury, is accompanied by swelling, giving way, locking, or loss of range of motion, or if you have neurological symptoms (numbness, tingling, weakness), see a doctor or physical therapist. They can assess whether imaging or specialist input is appropriate.