Neck Pain and Whiplash

Neck pain is pain, tension, or stiffness localized to the cervical spine, with or without radiation into the shoulder, arm, or head, and is one of the most common musculoskeletal complaints seen in primary care and pharmacy practice. Whiplash is a specific mechanism of injury -- a rapid hyperextension-hyperflexion (flexion-extension) transfer of energy to the neck, classically from a rear-end motor vehicle collision -- that can injure bone or soft tissue and produce a whiplash-associated disorder (WAD); most neck pain, whether from a whiplash mechanism or an insidious mechanical cause, is nonspecific and self-limited, resolving over days to a few weeks.^[1] Management turns on 3 questions asked at every visit: is this ordinary mechanical (nonspecific) neck pain, does it show the specific neurologic signature of cervical radiculopathy, or does it carry a red flag pointing to cord compression, fracture, vascular injury, infection, or malignancy -- this classification drives every downstream decision about imaging, immobilization, and drug therapy. A genuinely important shift in the evidence over the past decade has moved practice away from rest and cervical collar immobilization and toward early, active mobilization as the default for the large majority of patients, with pharmacotherapy positioned as an adjunct to that activity-based recovery rather than as the primary treatment.

Mechanical (nonspecific) neck pain

Axial neck pain that worsens with movement or prolonged static posture (e.g., desk or screen work) and improves with rest or a position change, without radiation below the shoulder and without a demonstrable neurologic deficit. This is the presentation in the large majority of patients and does not require imaging or a specific structural diagnosis before starting treatment.

Cervical radiculopathy

Pain referred from the neck into the arm, accompanied by a dermatomal sensory change, a myotomal motor deficit, or a diminished reflex corresponding to a specific cervical nerve root -- most often from a herniated disc or degenerative foraminal narrowing compressing the root. A positive Spurling test (neck extension, lateral flexion, and axial compression toward the symptomatic side reproducing the arm pain) and a positive cervical distraction test (manual traction relieving the arm pain) both support the diagnosis. This distinction matters because radiculopathy points toward a specific anatomic cause and dermatomal exam pattern (see Assessment and Diagnosis) and changes the immobilization and referral decisions described below.

Whiplash presentation

Whiplash follows a specific injury mechanism (most often a rear-end motor vehicle collision) and, beyond neck pain, can produce a broader symptom complex under the whiplash-associated disorder (WAD) umbrella: headache, shoulder or interscapular pain, jaw pain, dizziness, visual disturbance, and cognitive complaints such as poor concentration or memory. Symptom onset is sometimes delayed by several hours after the collision rather than immediate.

The Bone and Joint Decade Task Force classification is a companion staging system that applies to any neck pain, not only whiplash, and roughly parallels the WAD grades above.^[3]

Risk factors for developing neck pain

• Poor posture or prolonged screen-based or desk work with limited neck movement.
• Heavy manual labour or repetitive, awkward neck loading.
• Whiplash-specific mechanism: a rear-end motor vehicle collision, being struck while stationary or unaware, or an improperly positioned head restraint.
• A prior episode of neck pain -- the strongest predictor of a future episode.
• Pre-existing psychological distress, anxiety, or depression.
• Smoking.
• Reduced neck and scapulothoracic muscle endurance and poor general physical conditioning.

Risk factors for poor outcome or chronicity ("yellow flags") -- screen for these explicitly by 4 weeks if symptoms or work absence persist

• Self-reported unexplained high-intensity pain and disability.
• Catastrophizing, or a belief that pain and activity are inherently damaging.
• Depression, anxiety, or signs of post-traumatic stress -- the Patient Health Questionnaire for Depression and Anxiety (PHQ-4) is a reasonable brief screening tool.
• Passive coping strategies -- an expectation of passive treatment rather than a belief that active participation will help; the Pain Self-Efficacy Questionnaire (PSEQ) is a reasonable tool to identify this.
• Avoidance of movement.
• A history of previous musculoskeletal pain.
• Compensation or litigation in progress, particularly with high compensation levels or an adversarial relationship with the employer or insurer.
• Early, high-intensity health-care utilization immediately after the injury.^[4]

History

The Clinically Organized Relevant Exam (CORE) neck tool is a useful structured framework for history-taking and triage in neck pain, guiding the clinician through red-flag screening, pain pattern characterization, and referral decisions. At the first visit: explicitly screen for every red flag above; characterize whether pain is axial only or radiates into the arm below the shoulder; establish the mechanism (insidious versus a specific trauma or whiplash mechanism) and, for a trauma mechanism, apply the Canadian C-Spine Rule below before any mobilization; grade WAD or Bone and Joint Decade severity if the presentation is acute (1-7 days) or trauma-related; and screen explicitly for yellow flags (see Risk Factors) if symptoms or work absence persist past 4 weeks. Review prior episodes, prior treatment response, and current medication use.

Physical examination

• Observe gait, including heel walking and toe walking, and watch for a Trendelenburg gait pattern -- all 3 are screens for a lumbosacral or more diffuse neurologic process that would change the working diagnosis.
• Document cervical range of motion (flexion, extension, rotation, and lateral flexion) as a baseline, along with cervical and shoulder posture.
• Screen cervical and supraclavicular lymph nodes.
• Active shoulder range of motion; perform a full shoulder exam if a finding is abnormal, since shoulder pathology can mimic or coexist with neck pain.
• Sitting: biceps (C5-C6) and triceps (C7) reflexes; myotomal strength testing -- trapezius shrug (C4), deltoid/shoulder abduction (C5), biceps/elbow flexion (C6), triceps/elbow extension (C7), and 3rd-finger flexion (C8); dermatomal light-touch sensation over the trapezius (C4), lateral shoulder (C5), thumb and lateral forearm (C6), middle finger (C7), and small finger and medial forearm (C8).
• Radicular testing: Spurling test and cervical distraction test (see Recognize the Condition).
• Upper motor neuron screen for cervical myelopathy: plantar response and Hoffman test.

Diagnostic imaging

For a trauma mechanism, apply the Canadian C-Spine Rule in an alert, stable patient (Glasgow Coma Scale 15) before deciding whether imaging or active range-of-motion testing is safe.^[5]

Beyond the trauma setting, reserve plain radiography for neck pain persisting more than a few weeks, and reserve MRI or CT for suspected nerve root or spinal cord involvement, a red flag, or neck pain that remains persistent or progressive after 4-6 weeks of guideline-concordant treatment.^[1]

• Acute, 1-7 days: reduce distress, and identify a patient who needs urgent surgical intervention (WAD-IV/Bone and Joint Decade Grade IV, cervical myelopathy, or another red flag).
• Acute, 1-4 weeks: promote active therapy to restore function; return to normal activity and work as soon as tolerated.
• Subacute, 4-12 weeks: interrupt progression to chronicity; promote active therapy while encouraging return to work.
• Chronic, over 12 weeks (or 6 months or more): multimodal management of chronic pain and disability, emphasizing restored function and independence rather than complete pain resolution.
• At every stage: avoid over-treatment -- unnecessary imaging, prolonged immobilization, and unwarranted opioid exposure -- since most patients recover with active, noninvasive management.

• Patient education and reassurance about the generally favourable natural history of mechanical neck pain and most whiplash -- deliver this explicitly, not as an assumed default.
• Encourage early, active return to normal activity and work as tolerated; avoid bed rest and avoid routine cervical collar use (see Choose Initial Treatment).
• Individualized cervical, scapulothoracic, and shoulder-girdle stretching and strengthening exercise, progressing as tolerated -- the single best-supported nonpharmacologic intervention at every stage, from acute through chronic neck pain.^[7][8]
• Self-applied heat can be recommended for symptomatic relief; cold application is reasonable if the patient finds it more soothing.^[1]
• Manual therapy (mobilization or spinal manipulation) may be offered, most often combined with active exercise rather than used alone -- evidence for manual therapy used alone in subacute and chronic neck pain is limited and low quality^[9] -- and only by a practitioner with certified manual-therapy skills and appropriate screening for contraindications, since there is a small but real risk of vertebrobasilar stroke after cervical manipulation.^[10]
• Massage may add benefit when combined with manual therapy; evidence for massage used alone is poor, and massage should not be used as a stand-alone treatment for acute neck pain.
• Cognitive behavioural therapy (CBT) may give short-term pain relief for subacute neck pain as part of a multimodal plan, though it has not shown a clear benefit on disability in chronic neck pain by itself.
• For subacute or chronic neck pain with ongoing work absence: a coordinated, timelined return-to-work plan involving the workplace -- this drives successful return to work more reliably than the specific clinic treatment modality chosen.
• Individually supervised active exercise programs, rather than group exercise classes, can improve pain and function in chronic neck pain; no single supervised program has been shown superior to another.
• Evidence is weak, contradictory, or insufficient for several other modalities, and they are not routinely recommended: acupuncture (outside a combined-with-activation chronic-pain setting), dry needling, magnetic therapy, transcutaneous electrical nerve stimulation, mechanical traction, electrotherapy, laser therapy, and ultrasound.
• Interventional and procedural options exist for refractory chronic neck pain or radiculopathy but require specialist referral and generally lack consistent supporting evidence: local anesthetic infiltration of trigger or tender points may give short-term relief; epidural or facet (zygapophyseal) joint corticosteroid injection has inadequate evidence for chronic neck pain outside radicular symptoms; onabotulinumtoxinA injection has not shown benefit for pain or disability in subacute or chronic neck pain compared with other treatments and is not recommended for this indication; a short course of epidural or selective nerve root corticosteroid injection may give short-term relief specifically for radicular symptoms.
• Expert opinion favours multidisciplinary pain management for chronic neck pain with impaired function and failed work return, coordinated with the workplace and, where applicable, the compensation system.

Pregnancy

Breastfeeding

Acetaminophen at therapeutic doses is appropriate. Ibuprofen has been used safely during breastfeeding. If an opioid is used at all, limit it to 2-3 days with toxicity counselling for both the breastfeeding parent and the infant -- see the Low Back Pain chapter for complete breastfeeding-specific dosing detail across the shared analgesic classes covered there.

Pediatrics

This chapter addresses adult mechanical neck pain and whiplash. Neck pain in a child or adolescent is much less common than in an adult and warrants a lower threshold for further assessment rather than being managed with this adult algorithm -- pediatric-specific dosing for the drugs in this chapter is not established here.

Older adults

Muscle relaxants (cyclobenzaprine, methocarbamol, orphenadrine, baclofen, tizanidine) are not recommended in patients over 65 given increased sedation and fall risk. NSAIDs carry higher GI, renal, and cardiovascular risk in this population -- try a topical NSAID or acetaminophen first, and use the lowest effective oral NSAID dose for the shortest duration if one is needed. Before any manual therapy or manipulation, screen carefully for vertebral artery disease risk factors and osteoporosis-related fracture risk, both more common with age.

Renal and hepatic impairment

Avoid NSAIDs, including a topical NSAID used over a large area or for a prolonged period, in significant renal impairment. Acetaminophen requires a lower total daily dose and closer monitoring in significant hepatic impairment. Gabapentin requires renal dose adjustment.

• Acute, 1-7 days: reassess for a red flag that may have since developed, or for a need for urgent surgical referral (WAD-IV).
• Acute, 1-4 weeks: track return to function and activity, not pain score alone, as the primary marker of progress.
• Subacute, 4-6 weeks: reassess if symptoms or work absence have not resolved -- this is the trigger point to screen, or re-screen, explicitly for yellow flags and to reconsider imaging if not already done.^[1]
• Chronic: scheduled follow-up with explicit functional goals, not pain intensity alone, tracked at each visit.
• Whenever a muscle relaxant is prescribed: confirm the course is limited to 1-2 weeks and reassess sedation and fall risk at follow-up.
• Whenever an opioid is prescribed: confirm an agreed tapering strategy was documented before starting, and reassess the ongoing need and morphine-equivalent dose at every refill.^[6]
• Before or after manual therapy or manipulation: confirm no new neurologic symptom suggesting vertebral artery dissection has developed.

1. Reassess for a red flag that may have been missed or has since developed -- do not assume the working diagnosis of mechanical neck pain or WAD-I to WAD-III whiplash is still correct just because it was correct initially.
2. Confirm adherence to, and adequate duration of, the first-line nonpharmacologic measures (early mobilization, active exercise) and analgesic already tried before adding or switching a medication.
3. Add or intensify a nonpharmacologic modality -- structured exercise or manual therapy if not yet trialled, or combining modalities if a single modality alone has been inadequate.
4. Explicitly screen for yellow-flag psychosocial risk if not already done, particularly once symptoms or work absence pass the 4-week mark.
5. Reconsider imaging if symptoms are persistent or progressive after 4-6 weeks of guideline-concordant treatment, or if a new red flag has developed.^[1]
6. For cervical radiculopathy not improving with conservative management, refer for specialist assessment of injection therapy or surgical evaluation.
7. Refer to a multidisciplinary chronic pain management program for marked functional disability persisting despite the above.
8. If an opioid trial is being considered or is already underway and not achieving its goal, reassess appropriateness against the criteria in Choose Initial Treatment and begin the pre-agreed taper rather than continuing to escalate the dose.
9. After a failed multidisciplinary program, identify specific barriers before considering a second attempt: an undertreated psychiatric disorder, an attitudinal barrier to change, a substance or medication misuse problem, a previously undetected medical or surgical issue, or an unresolved workplace or compensation obstacle.

• Prescribing a cervical collar or bed rest for uncomplicated (WAD-I to WAD-III) neck pain or whiplash -- prolonged immobilization is now understood to delay, not speed, recovery for the large majority of patients.
• Ordering imaging for acute or recurrent neck pain without a red flag, or skipping the Canadian C-Spine Rule after trauma before deciding whether imaging is required.
• Reflexively combining an NSAID with a muscle relaxant and/or an opioid -- this combination increases sedation and adverse effects without clearly improving pain or function over a single agent.
• Continuing a muscle relaxant beyond a short, 1-2 week course, or using one routinely in a patient over 65.
• Starting an opioid as 1st-line therapy, or continuing one beyond 3-5 days for acute pain without a documented review.
• Missing a cervical myelopathy red flag -- gait disturbance, bilateral limb symptoms, or new bowel or bladder dysfunction always needs same-day urgent assessment, not a trial of conservative therapy first.
• Missing a possible vertebral artery dissection in a patient with sudden severe neck pain or headache plus a neurologic symptom, especially after trauma or before referring for manual therapy or manipulation.
• Assuming acetaminophen gives a clear analgesic benefit for neck pain specifically -- current evidence does not support this; it is chosen for safety, not superior effectiveness.
• Failing to screen for yellow flags once symptoms or work absence pass the 4-week mark.
• Managing chronic neck pain with medication alone, without a coordinated exercise-based and, where indicated, workplace-integrated plan.
• Treating whiplash and ordinary mechanical neck pain as identical when a WAD or Bone and Joint Decade grade has not actually been documented -- grade drives the collar-exception decision and referral urgency.

How to use this table: doses are adult doses for mechanical neck pain, whiplash, and cervical radiculopathy and require patient-specific confirmation, including renal/hepatic adjustment. This chapter does not establish pediatric dosing -- see Special Populations. See the Acute Pain and Low Back Pain chapters for the complete shared-class dosing detail (including the full strong-opioid ladder) and the Neuropathic Pain chapter for gabapentinoid/tricyclic titration schedules used here for a neuropathic-featured component. Select any drug name to open its complete Pharmasist Drug Database page.

Nonopioid analgesics

NSAIDs, oral

No NSAID or COX-2 inhibitor has been shown more effective than another for neck pain specifically -- select by GI/cardiovascular risk and tolerability. Oral route only; do not use a parenteral NSAID for neck pain. Avoid in severe renal impairment.

NSAIDs, topical

Minimal systemic absorption -- a reasonable option to reduce systemic NSAID exposure, particularly with GI or renal risk factors.

Muscle relaxants

Evidence for benefit in neck pain is limited and inconsistent, and a current evidence-based guideline recommends against muscle relaxants for neck pain altogether -- reserve for significant muscle spasm, short-course use only (no more than 1-2 weeks). Not recommended in patients over 65. Avoid in pregnancy (insufficient safety data).

Benzodiazepine (short-term muscle relaxant use)

GABA derivatives

Not a Health Canada-approved indication for neck pain -- clinical experience only. May be considered for cervical radiculopathy with a neuropathic component or chronic neck pain with pain/tenderness across multiple sites; see the Neuropathic Pain chapter for a complete titration schedule.

Tricyclic antidepressant

Widely used for soft-tissue pain, but not proven effective specifically for mixed musculoskeletal/soft-tissue pain -- select primarily to treat a comorbid indication (depression, insomnia, neuropathic-featured pain).

Opioids

Avoid as routine therapy at every stage. Reserve for severe pain unresponsive to the measures above, at the lowest effective dose, for the shortest duration, with mandatory review at 3-5 days. See the Low Back Pain chapter for the complete strong-opioid ladder (morphine, hydromorphone, oxycodone, transdermal fentanyl/buprenorphine) if a chronic neck pain trial reaches that level -- not duplicated here since dosing and stewardship principles are identical.