Definition and Overview
Cervicogenic headache (CEH) is a secondary headache originating from structural abnormalities of the cervical spine, including bones, intervertebral discs, joints, muscles, and ligaments. It was first proposed as a distinct clinical entity by Sjaastad et al. in 1983 [1], and was subsequently recognized as an official disorder in the International Classification of Headache Disorders, 3rd edition (ICHD-3) by the International Headache Society.
Approximately 15-20% of all chronic headache patients are estimated to have cervicogenic headache [3]. The prevalence in the general population is reported to be approximately 0.4-4.6%, with women affected approximately four times more frequently than men [5]. The prevalence is even higher in patients with whiplash injury after motor vehicle accidents, with rates reported as high as 53% [3].
Cervicogenic headache is a disorder with a distinct pathophysiological mechanism that differentiates it from simple "headache due to neck stiffness." Pain signals originating from the upper cervical spine (C1-C3) converge with intracranial pain pathways through the trigeminocervical nucleus, causing the pain to be perceived as head pain. Understanding this mechanism is the starting point for accurate diagnosis and treatment.
Etiology
The pain source of cervicogenic headache is concentrated in the upper cervical (C1-C3) segments. Sensory nerves from this region converge at the trigeminocervical nucleus, where the subnucleus caudalis of the spinal nucleus of the trigeminal nerve overlaps with the upper cervical dorsal horn. This convergence phenomenon causes pain signals from cervical pathology to be referred to the forehead, periorbital area, and temporal region -- areas innervated by the trigeminal nerve [3].
The specific causative structures are as follows.
The cervical zygapophyseal (facet) joint is the most common pain generator. In particular, pathology of the C2-3 facet joint is most closely associated with cervicogenic headache. Bogduk reported that the C2-3 facet joint was identified as the pain source in approximately 70% of cervicogenic headache cases [3]. Degenerative changes, post-traumatic injury, and synovial inflammation of the facet joints are contributing causes.
Pathology of the atlanto-occipital joint (C0-1) and atlanto-axial joint (C1-2) can also cause headache. These joints are responsible for a significant portion of cervical rotation and flexion-extension movement, making them vulnerable to degeneration and trauma.
Herniation or degenerative changes of the cervical intervertebral disc can produce headache when they irritate the upper cervical nerve roots. C2-3 disc pathology is the most common.
Tension and shortening of the muscles surrounding the upper cervical spine also contribute. Hypertonicity or myofascial trigger points of the suboccipital muscles, upper trapezius, sternocleidomastoid, and semispinalis capitis can provoke or exacerbate headache.
Entrapment of the greater occipital nerve (C2) is also an important cause. The greater occipital nerve originates from the C2 dorsal ramus and courses through the suboccipital muscles and upper trapezius; compression along this path produces pain extending from the occiput to the vertex.
Symptoms
The most characteristic clinical feature of cervicogenic headache is pain that occurs on only one side of the head. The pain is strictly unilateral and does not switch to the opposite side [1][2]. It begins in the occiput and radiates to the ipsilateral temporal region, forehead, and periorbital area.
The pain quality is predominantly dull and aching, with non-pulsating pain prevailing over throbbing. Pain intensity ranges from moderate to severe, and the excruciating unilateral pulsating pain seen in migraine is uncommon.
Provocation and aggravation by neck movement is a key diagnostic clue. Headache is triggered or worsened by rotating the head, extending it upward, or tilting it to one side [1][2]. Headache also worsens after maintaining the same posture for prolonged periods (computer work, reading, driving).
Concurrent pain in the ipsilateral neck, shoulder, and arm is common. Arm pain tends to present as non-specific referred pain rather than radicular pain [2].
Reduced cervical range of motion is observed, with rotation toward the symptomatic side being particularly limited.
Other accompanying symptoms may include ipsilateral periorbital swelling, tearing, and blurred vision. However, the classic nausea, photophobia, and phonophobia seen in migraine are relatively mild. In some patients, however, these autonomic symptoms may be present, making differentiation from migraine challenging [4].
Headache episodes last from several hours to several days. They initially occur intermittently but gradually increase in frequency, progressing to chronicity [5].
Diagnosis
The diagnosis of cervicogenic headache is made through a combination of clinical criteria, physical examination, imaging studies, and diagnostic nerve blocks.
Diagnostic Criteria
The diagnostic criteria proposed by Sjaastad et al. and established by the Cervicogenic Headache International Study Group (CHISG) are most widely used [1][2]. The major criteria are as follows.
- Unilateral headache that does not switch to the contralateral side
- Headache provoked by neck movement, sustained awkward postures, or external pressure over the ipsilateral occipital or upper cervical region
- Non-radicular pain in the ipsilateral neck, shoulder, or arm
- Temporary abolition of headache following diagnostic anesthetic block
The ICHD-3 diagnostic criteria require clinical, imaging, or laboratory evidence of a cervical disorder or lesion, acceptance of the lesion as the headache cause, and improvement of headache following treatment or resolution of the causative condition.
Physical Examination
Cervical examination identifies restricted movement and tenderness of the upper cervical segments. The cervical flexion-rotation test is a useful test for evaluating C1-2 joint dysfunction, with a reported sensitivity of 91% and specificity of 90% [6].
Tenderness and trigger points of the suboccipital muscles, upper trapezius, and sternocleidomastoid are palpated. Tenderness at the greater occipital nerve exit point (lateral to the occipital protuberance) is also assessed.
Imaging Studies
Cervical plain radiographs evaluate cervical alignment, degenerative changes, and instability. Cervical MRI is necessary to identify soft tissue pathology such as disc lesions, nerve root compression, and ligamentous injury. However, imaging findings alone cannot confirm the diagnosis of cervicogenic headache; correlation with clinical findings is essential [3].
Diagnostic Nerve Block
Diagnostic nerve block is the most definitive method for diagnosing cervicogenic headache [3]. By injecting local anesthetic into the suspected pain source (facet joint, nerve root, or greater occipital nerve), temporary resolution of headache confirms the structure as the pain generator. C2-3 facet joint block and greater occipital nerve block are the most commonly performed procedures.
Differential Diagnosis
Cervicogenic headache shares many clinical features with other primary headaches, making accurate differentiation essential.
Differentiation from Migraine
Migraine presents with pulsating pain on one side of the head lasting 4-72 hours, accompanied by prominent nausea, photophobia, and phonophobia. Unlike cervicogenic headache, migraine pain can alternate sides, and aura may be present. Cervicogenic headache has more distinct provocation by neck movement and a characteristic radiation pattern from the occiput to the frontal region. However, since many chronic migraine patients also have concurrent cervical muscle tension, coexistence of the two conditions is not uncommon [4].
Differentiation from Tension-type Headache
Tension-type headache is characterized by bilateral, pressing or tightening pain of mild to moderate intensity. Cervicogenic headache is unilateral with a more distinct association with neck movement, and accompanying referred pain to the ipsilateral shoulder or arm. In tension-type headache, muscle tenderness in the frontal and temporal regions appears bilaterally and symmetrically, whereas in cervicogenic headache, tenderness of the ipsilateral upper cervical and suboccipital muscles is more prominent.
Differentiation from Occipital Neuralgia
Occipital neuralgia presents with lancinating, paroxysmal pain in the distribution of the greater or lesser occipital nerve. In contrast to the dull, continuous pain of cervicogenic headache, it manifests as electric shock-like momentary pains recurring over seconds to minutes. However, since greater occipital nerve entrapment can be the cause of both conditions, overlap may occur [5].
Treatment
Treatment of cervicogenic headache aims at direct intervention on the causative pain-generating structure and functional recovery. It is applied in a stepwise manner from conservative to interventional treatment.
Physical Therapy
Physical therapy is recommended as the first-line treatment for cervicogenic headache. Joint mobilization techniques improve restricted movement of the upper cervical spine, while soft tissue release techniques relieve hypertonic muscles. In a randomized controlled trial by Jull et al., 72% of patients who received physical therapy (manual therapy plus exercise therapy) achieved a 50% or greater reduction in headache frequency, and this effect was maintained at 12-month follow-up [6].
Nerve Block
Greater occipital nerve block involves injecting local anesthetic and a small amount of corticosteroid around the greater occipital nerve. It has both diagnostic and therapeutic value. Cervical facet joint block reduces pain by injecting local anesthetic into the facet joint confirmed as the pain source. Procedures are performed under ultrasound or fluoroscopic guidance, and repeated procedures can provide long-term pain control [3].
Radiofrequency Neurotomy
Radiofrequency neurotomy (RF) applies radiofrequency thermal energy to the medial branch nerves that transmit pain from the facet joint, thereby interrupting nerve conduction. It is performed when the facet joint has been confirmed as the pain source through diagnostic blocks. In a randomized controlled trial by Lord et al., 58% of patients who underwent radiofrequency neurotomy achieved complete pain relief for a median of 27 weeks, compared to only 8 weeks in the control group [7]. Pain may recur after nerve regeneration, but repeat procedures can be performed.
Manual Therapy
Manual therapy involves the application of hands-on techniques to the cervical joints and surrounding soft tissues. It includes high-velocity low-amplitude (HVLA) thrust manipulation and joint mobilization of the upper cervical spine. Its effectiveness is maximized when combined with physical therapy [6].
Exercise Therapy
Deep cervical flexor strengthening exercises are a cornerstone of cervicogenic headache management. Craniocervical flexion exercises improve endurance and coordination of the deep cervical muscles and enhance cervical stability. Scapular stabilization exercises also help reduce the load on the upper cervical spine. Exercise therapy is an effective strategy not only for short-term pain reduction but also for long-term recurrence prevention [6].
Pharmacotherapy
No medications are specifically approved for cervicogenic headache; however, nonsteroidal anti-inflammatory drugs (NSAIDs), muscle relaxants, and tricyclic antidepressants (amitriptyline) are used as adjunctive treatment. Pharmacotherapy alone has limited efficacy, and combination with physical therapy and interventional procedures is the standard approach [5].
Lifestyle Guide
Postural correction is the foundation of cervicogenic headache prevention. When using a computer, adjust the monitor height so that the top of the screen is at eye level, and position the keyboard and mouse so that the elbows are maintained at 90 degrees. When sitting in a chair, keep the back pressed against the backrest and gently tuck the chin so that the head is aligned above the shoulders.
Correct forward head posture. For every 1 cm the head protrudes forward, approximately 1-1.5 kg of additional load is placed on the cervical spine. When using a smartphone, hold it at eye level or avoid prolonged use.
Perform neck stretches every 30-40 minutes. Slowly turn the head side to side, tilt the ear toward the shoulder, and perform chin tucks, holding each position for 15-20 seconds. Avoid abrupt neck rotation or excessive extension.
Adjust pillow height when sleeping. When lying on your side, the head, neck, and spine should be aligned in a straight line; when lying on your back, a height that maintains the cervical lordosis is appropriate. Pillows that are too high or too low place strain on the cervical joints.
Engage in regular aerobic exercise (walking, swimming, cycling) 3-5 times per week for at least 30 minutes. Perform deep cervical flexor strengthening exercises (chin tuck exercises) 10-15 repetitions daily. Include scapular retraction and stabilization exercises as well.
Pay attention to stress management. Emotional tension causes hypertonicity of the pericervical muscles, which exacerbates headache. Diaphragmatic breathing and progressive muscle relaxation techniques can be helpful.