What Is Cervical Disc Herniation?
Cervical disc herniation occurs when the nucleus pulposus of the cervical intervertebral disc displaces through a tear in the annulus fibrosus, potentially compressing nerve roots or the spinal cord. The most affected levels are C5-C6 and C6-C7, which correspond to the segments with greatest mobility of the cervical spine.
Although it is a frequent source of cervicobrachialgia (cervical pain radiating to the arm), it is essential to understand that disc herniation on MRI does not necessarily mean the herniation is causing symptoms. Studies in asymptomatic individuals show that disc protrusions and herniations are common findings related to aging.
Most cervical disc herniations respond to conservative treatment, and many partially or completely resorb over months — especially larger extrusions with a significant inflammatory component.
Herniated Disc
The nucleus pulposus extravasates through the ruptured annulus fibrosus, potentially compressing nerve roots or the spinal cord.
Radiated Pain
Radicular compression causes pain, tingling, and weakness that follow the dermatome of the affected root.
Natural Resorption
Many cervical herniations resorb spontaneously. 75-90% of patients improve without surgery.
Epidemiology
Cervical radiculopathy from disc herniation has an annual incidence of 83 per 100,000 inhabitants. Acute cervical disc herniations most often affect people between 30 and 50 years old. Men are slightly more affected than women (1.5:1). Levels C5-C6 and C6-C7 account for approximately 70% of all cervical herniations.
Pathophysiology
The cervical intervertebral disc is composed of a nucleus pulposus (gelatinous, rich in proteoglycans and water) surrounded by the annulus fibrosus (concentric collagen lamellae). With aging and repetitive microtrauma, the annulus undergoes degeneration and fissures, allowing migration of the nucleus pulposus.
Classification of Herniations
TYPES OF DISC HERNIATION
| TYPE | DEFINITION | CLINICAL FEATURE |
|---|---|---|
| Protrusion | Base of herniated material wider than the apex | Generally less symptomatic, favorable conservative response |
| Extrusion | Herniated material with base narrower than the apex | Greater potential for radicular compression, but GREATER chance of resorption |
| Sequestration | Free fragment separated from the disc of origin | May cause intense symptoms; spontaneous resorption frequent |
Pain Mechanisms
Pain in cervical disc herniation results from two complementary mechanisms. The first is direct mechanical compression of the nerve root in the intervertebral foramen, which causes ischemia and neural dysfunction. The second is chemical inflammation: the exposed nucleus pulposus releases phospholipase A2, TNF-alpha, interleukins, and nitric oxide that sensitize the nociceptors of the dorsal root ganglion.
Chemical inflammation explains why small herniations can cause intense pain (high inflammatory activity) and large herniations can be asymptomatic (low inflammatory activity). It also explains the resorption phenomenon: the inflammatory immune response to the nucleus pulposus material (recognized as "foreign" by the immune system) recruits macrophages that phagocytose the herniated fragment.
Symptoms
Symptoms depend on the location and size of the herniation. Posterolateral herniations (the most common) compress nerve roots, causing radiculopathy. Large central or paracentral herniations can compress the spinal cord, causing myelopathy.
Symptoms of Cervical Disc Herniation
- 01
Cervical pain with radiation to the arm
Pain follows the dermatome of the compromised root: C6 -> thumb and index finger; C7 -> middle finger; C5 -> lateral shoulder.
- 02
Tingling and numbness in the arm or hand
Paresthesias in a specific radicular territory, often worse at night or upon waking.
- 03
Specific muscle weakness
C5 -> deltoid; C6 -> biceps and wrist extensors; C7 -> triceps; C8 -> interossei and finger flexors.
- 04
Worsens with cervical extension and rotation
Movements that reduce the neural foramen (extension + ipsilateral rotation) aggravate radicular compression.
- 05
Worsens with cough, sneeze, and effort
The Valsalva maneuver increases intradiscal pressure, aggravating the protrusion and pain.
- 06
Relief with shoulder abduction
Placing the hand on the head relieves tension on the nerve root — Bakody sign.
Diagnosis
Diagnosis begins by correlating clinical history (pattern of pain radiation) with physical examination (provocative tests and neurologic assessment). Imaging confirms the presence and location of the herniation, and electroneuromyography can confirm the radiculopathy.
🏥Diagnostic Evaluation of Cervical Herniation
Fonte: North American Spine Society (NASS) Guidelines
Clinical Examination
- 1.Spurling test: axial compression + extension + rotation reproduces radicular pain (specificity > 90%)
- 2.Cervical distraction test: traction relieves pain (indicates foraminal compression)
- 3.Bakody test: shoulder abduction relieves pain (suggests radicular compression)
- 4.Segmental neurologic assessment: strength, sensation, and reflexes by myotome/dermatome
Complementary Exams
- 1.Magnetic resonance imaging: gold standard — visualizes herniation, radicular and medullary compression
- 2.Electroneuromyography: confirms active radiculopathy and excludes peripheral neuropathies
- 3.Computed tomography: details bony component (foraminal stenosis)
- 4.Functional X-ray: assesses segmental instability and alignment
CORRELATION BETWEEN DISC LEVEL AND AFFECTED ROOT
| DISC LEVEL | COMPRESSED ROOT | MOTOR DEFICIT | ALTERED REFLEX |
|---|---|---|---|
| C3-C4 | C4 | Diaphragm (rare), trapezius | No specific reflex |
| C4-C5 | C5 | Deltoid, biceps | Biceps |
| C5-C6 | C6 | Biceps, wrist extensors | Brachioradialis |
| C6-C7 | C7 | Triceps, wrist flexors, finger extensors | Triceps |
| C7-T1 | C8 | Hand interossei, finger flexors | No specific reflex |
DIAGNÓSTICO DIFERENCIAL
Differential Diagnosis
Cervical Spondylosis
- Age > 50 years
- Gradual onset
- Multiple levels affected
- Osteophytes on X-ray
Testes Diagnósticos
- X-ray and cervical CT
Cervical Spinal Stenosis
Read more →- Myelopathy (signs of cord compression)
- Gait difficulty
- Positive Hoffmann sign
Testes Diagnósticos
- Cervical MRI with canal measurement
Rotator Cuff Tendinopathy
Read more →- Shoulder pain with painful arc
- Rotation weakness
- No radiation below the elbow
Testes Diagnósticos
- Shoulder tests, ultrasound
Thoracic Outlet Syndrome
- Ulnar paresthesias (C8-T1)
- Worsens with arms elevated
- Possible vascular alteration
Testes Diagnósticos
- Roos test, EMG with maneuvers
Spinal Tumor
- Progressive and nocturnal pain
- Weight loss
- Progressive neurologic deficit
Testes Diagnósticos
- Contrast-enhanced MRI
Treatments
Conservative treatment is the initial pillar for cervical disc herniation without myelopathy. Robust evidence shows that 75-90% of patients achieve satisfactory symptom resolution without surgery.
TREATMENTS FOR CERVICAL DISC HERNIATION
| TREATMENT | MECHANISM | EVIDENCE | CONSIDERATIONS |
|---|---|---|---|
| NSAIDs + Gabapentin/Pregabalin | Anti-inflammatory + neuropathic pain modulation | Strong | First medication line — synergistic combination |
| Oral corticosteroid (short course) | Potent anti-inflammatory, reduces radicular edema | Moderate | Short course (5-7 days) in intense acute phase |
| Acupuncture / Electroacupuncture | Nociceptive modulation, neural anti-inflammatory | Moderate, with methodologic heterogeneity | Effective adjuvant — control of pain and paresthesias |
| Exercise + Neurodynamics | Neural sliding, cervical stabilization | Strong | Early initiation — basis of functional treatment |
| Intermittent cervical traction | Foraminal opening, reduction of compression | Moderate | Useful when it relieves symptoms — contraindicated in instability |
| Cervical epidural injection | Concentrated periradicular anti-inflammatory | Moderate | Refractory cases > 6 weeks of conservative treatment |
| Surgery (ACDF) | Direct neural decompression + stabilization | Strong (specific indications) | Myelopathy, progressive motor deficit, or refractoriness |
Treatment Timeline
Phase 1
0-2 weeksAcute Pain Control
NSAIDs, gabapentin/pregabalin, oral corticosteroid if necessary. Early acupuncture. Relative rest (do NOT use a collar for more than 1-2 weeks). Guidance and education.
Phase 2
2-6 weeksMobilization and Neurodynamics
Neural sliding techniques, gentle cervical mobilization, isometric exercises. Continuation of acupuncture.
Phase 3
6-12 weeksProgressive Strengthening
Progressive cervical and scapulothoracic exercises. Proprioceptive training. Gradual reduction of medications.
Reassessment
12 weeksTherapeutic Decision
If significant improvement: maintenance with exercises. If refractory: consider epidural injection or surgical evaluation.
Acupuncture and Laser Therapy
Acupuncture can serve as an adjuvant in the conservative treatment of cervical disc herniation, acting on radicular pain mechanisms. Some meta-analyses suggest additional benefit over conventional treatment alone for pain reduction and functional improvement, with a moderate level of evidence and significant methodologic heterogeneity.
Mechanisms include: reduction of periradicular proinflammatory cytokines (TNF-alpha, IL-1beta, IL-6), descending inhibitory modulation via the periaqueductal gray and nucleus raphe magnus, segmental inhibition of nociceptive transmission, and improved microcirculation in the neural foramen with reduced radicular edema.
Electroacupuncture with alternating frequencies (2/100 Hz) is particularly effective in the neuropathic pain of cervical radiculopathy. The 2 Hz frequency releases enkephalins and beta-endorphins (lasting analgesia), while 100 Hz releases dynorphins (rapid analgesia). Alternation maximizes the activation of multiple endogenous opioid systems.
Laser Therapy (Photobiomodulation)
Laser therapy applied over the cervical foramina and along the neural pathway offers neuroprotective and anti-inflammatory effects. The mechanism involves stimulation of mitochondrial cytochrome c oxidase in the compressed nerve, which increases ATP production and accelerates axonal regeneration.
Experimental studies show that photobiomodulation reduces wallerian degeneration, promotes remyelination, and decreases intraneural edema in models of radicular compression. Clinically, combining laser at the cervical foramina with acupuncture along the affected dermatome offers a synergistic approach.
Prognosis
The prognosis of cervical disc herniation is favorable. Most herniations follow a natural history of spontaneous improvement, with partial or complete resorption documented on MRI follow-up. Extrusions and sequestrations have the highest resorption rates.
Factors favoring better prognosis with conservative treatment include: herniation with extrusion or sequestration (paradoxically, those that resorb most), absence of motor deficit, short symptom duration before treatment, and absence of associated bony foraminal stenosis. Myelopathy significantly worsens prognosis and frequently requires surgical intervention.
Myths and Facts
Myth vs. Fact
Cervical disc herniation always requires surgery.
75-90% of patients improve without surgery. Surgery is reserved for myelopathy, progressive motor deficit, or pain refractory to adequate conservative treatment.
The larger the herniation, the worse the prognosis.
Paradoxically, larger herniations (extrusions and sequestrations) have the highest rates of spontaneous resorption (60-80%). Large herniations with a high inflammatory component attract macrophages that phagocytose them.
The herniation on MRI is the certain cause of my pain.
Cervical protrusions and herniations are found in 37% of asymptomatic individuals in the third decade. Clinical correlation — not just imaging — determines whether the herniation is symptomatic.
If I have a cervical herniation, I cannot exercise or have acupuncture.
Guided exercises and acupuncture are pillars of conservative treatment. Neurodynamic and cervical stabilization exercises accelerate recovery, and acupuncture reduces pain and paresthesias.
When to Seek Medical Care
Frequently Asked Questions about Cervical Disc Herniation
Yes. Follow-up MRI studies show that 60-80% of cervical disc extrusions and sequestrations undergo partial or complete resorption over 6-12 months. The mechanism is immunologic: the exposed nucleus pulposus material is recognized as foreign, attracting macrophages that phagocytose the fragment. Paradoxically, larger extruded herniations tend to resorb more than smaller protrusions.
Surgery is indicated in specific situations: cervical myelopathy (spinal cord compression with signs such as gait difficulty and hand incoordination), progressive motor deficit (weakness that worsens despite conservative treatment), incapacitating radicular pain refractory to 6-12 weeks of adequate treatment, and documented cervical instability. The most common procedure is anterior cervical discectomy and fusion (ACDF), with a satisfaction rate above 90% when well indicated.
Acupuncture can serve as an adjuvant in conservative treatment. It is proposed to act by reducing periradicular inflammation, modulating neuropathic pain transmission, and improving microcirculation in the neural foramen. Electroacupuncture with alternating frequencies (2/100 Hz) is described as an option for neuropathic pain, though protocols are heterogeneous. Some studies report combination with laser therapy at the cervical foramina. Some patients report improvement of paresthesias in the first sessions, but the response is individual.
Yes, exercises are fundamental and should start early. Neurodynamic exercises (neural sliding) reduce tension on the compressed root. Cervical stabilization exercises strengthen the deep flexors and improve motor control. Progression should be gradual, respecting pain limits. High-impact cervical activities (trampoline jumps, head dives) should be avoided during the recovery phase.
If the herniation was an incidental finding (discovered on an exam done for another reason) and you are asymptomatic, no specific treatment is needed. Disc protrusions are a normal finding of aging — present in 37% of healthy individuals in the third decade. Only herniations that cause symptoms (radiating pain, tingling, weakness) require treatment.
A typical cycle includes 8-12 sessions, twice weekly in the acute phase and weekly in maintenance. Paresthesias generally improve between the 2nd and 4th sessions, while pain improves more gradually. The physician acupuncturist combines manual acupuncture, electroacupuncture along the affected dermatome, and laser therapy at the cervical foramina, adjusting the protocol based on clinical response.
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