Occipital neuralgia (ON) is a painful condition affecting the posterior head in the distributions of the greater occipital nerve (GON), lesser occipital nerve (LON), third occipital nerve (TON), or a combination of the three. It is paroxysmal, lasting from seconds to minutes, and often consists of lancinating pain that directly results from the pathology of one of these nerves. It is paramount that physicians understand the differential diagnosis for this condition and specific diagnostic criteria. There are multiple treatment modalities, several of which have well-established efficacy in treating this condition.
ON is a result of GON pathophysiology in 90% of cases. Ten percent of cases are due to LON causes, and rarely is the TON thought to be involved. ON almost always results from the compression of one of these nerves at one of several anatomic points. In fact, for the various neuralgias described in the International Classification of Headache Disorders, Third Edition (ICHD-3), in the majority of cases many of the traditional neuralgias are no longer considered to result from primary nerve pathophysiology (e.g., herpes zoster, other infections, demyelinating lesions).
Rarely, other sensory cutaneous nerves may overlap the typical distribution area of the occipital nerves. In one case report, the suboccipital nerve supplied a cutaneous branch in the normal distribution of the greater occipital nerve. Such variations could contribute to unremitting neuralgia in that region.
In one study investigating the incidence of facial pain in a Dutch population, ON comprised 8.3% of facial pain cases. The total incidence of ON was 3.2 per 100,000 people, with a mean age of diagnosis of 54.1 years (standard deviation of 16.2 years).
An understanding of ON is incomplete without some basic knowledge of the anatomy of each of these nerves.
For the GON, multiple possible compression points exist that may result in neuralgia. These include the C2 nerve root, the obliquus capitis inferior muscle, the semispinalis capitis muscle, instances where the nerve penetrates the trapezius muscle, and instances where the occipital artery and GON intersect. The occipital nerve itself is quite large, measuring 2.5 to 3.5mm in diameter, which may predispose it to compressive pathology.  Muscle hypertrophy, tensing, or spasm of musculature in the area has been postulated to contribute to compression, as the condition is associated with stress and anxiety in many patients, and surgical sectioning of muscles in close approximation with the GON has led to pain relief. In certain cases, trauma and the formation of fibrocartilage calluses or other structural changes to the bony anatomy of the skull or spine can lead to this condition. Additionally, Arnold-Chiari malformation or arteriovenous malformations may contribute to nerve compression. Competent treatment of refractory disease requires knowledge of the anatomical associations of the occipital nerves; Cesmebasi et al., provide one such resource.
Patients presenting with a headache originating at the posterior skull base should be evaluated for ON. This condition typically presents as a paroxysmal, lancinating or stabbing pain lasting from seconds to minutes, and therefore a continuous, aching pain likely indicates a different diagnosis. ICHD-3 criteria require that the patient also have tenderness, dysesthesia, or allodynia over the area affected. A positive Tinel’s sign may be present over the distribution of the nerve, especially where the GON emerges at the base of the skull over the greater occipital notch. Pain may be unilateral or bilateral, but almost always begins unilateral and then may extend into a bilateral distribution over time. Bilateral symptoms are present in one-third of cases.
After completing a focused history and physical examination, the diagnosis is confirmed by local anesthetic blockade of the suspected nerve. This is a required step for diagnosis per ICHD-3 standards. The patient should have pain relief with the nerve block for at least the duration of the local anesthetic. Single diagnostic blocks carry false positive rates up to 40%, so the performance of a second block is prudent. If both blocks are positive the provider may be more confident as to the correct diagnosis. As compression is thought to be the main etiology for ON, imaging should be considered if there is suspicion of a lesion or mass at the affected site. 
There are multiple treatment options for ON. The most conservative treatments, such as immobilization of the neck by cervical collar, physiotherapy, and cryotherapy have not been shown to perform better than placebo. Non-steroidal anti-inflammatory drugs, tricyclic antidepressants, serotonin-norepinephrine reuptake inhibitors, and anticonvulsants may help to alleviate symptoms. Following diagnostic nerve blocks, therapeutic blocks may be attempted. Typically, a steroid is added to the local anesthetic with variable results. Botulinum Toxin A injection has emerged as a treatment with a conceptually lower side effect profile than many other techniques described here, with most recent trials demonstrating 50% or more improvement.
It remains a common practice to utilize a landmark-only approach when performing greater and lesser occipital nerve blocks. For blockade of both nerves, medication is infiltrated along the nuchal ridge. This technique, while easy to perform and relatively safe if done correctly, may not be particularly accurate and as a result, could theoretically increase the risk of a false positive result. To improve accuracy, ultrasound-guided techniques were developed. The original ultrasound-guided technique for injection of the GON (utilized routinely by this article's editor for diagnostic injection and for cryoablation) was described by Greher et al in 2010; it targets the nerve as it courses superficial to the obliquus capitis inferior muscle at the C1-C2 level.
There are several advanced interventional procedures in clinical use.
The differential diagnosis for ON includes any disorder which similarly presents with a headache or facial pain. Because connections are possible between the occipital nerves and cranial nerves VIII, IX, and X, patients can sometimes present with confusing symptoms, such as vision impairment, dizziness, or sinus congestion. The conditions most easily mistaken with ON for other headache and facial pain disorders, including migraine, cluster headache, tension headache, and hemicrania continua. Mechanical neck pain from an upper disc, facet, or musculoligamentous sources may refer into the occiput, but is not classically lancinating or otherwise neuropathic and should not be confused with ON. A crucial step in differentiating ON from other disorders is relief with an occipital nerve block.
Short term relief is common with basic interventional treatments. Rarely, diagnostic injections of local anesthetic with or without steroid can yield up to several months of analgesia. Advanced treatments mentioned above may result in improvements of ranging from weeks to years.
Complications from procedures have been reported in the literature. In a case series reviewing over a hundred thermal RFA procedures, one patient developed intraventricular hemorrhage and died after the case, which the authors attribute to hypertension during the procedure. The same paper reported a patient who developed Brown-Sequard syndrome from post-traumatic cervical syringomyelia, also after RFA.
As with all medical diagnoses, diagnostic tests, medication trials, and interventional treatments, patients should have the condition explained to them in a manner they understand based on their education level and background. It is important to consider important aspects of the patient’s lifestyle, and how the condition and any proposed treatment may affect them. The risks, benefits, and alternatives of any medication trial or procedure should be conveyed, and a shared medical decision-making model should be utilized with the patient.
It is natural to expect that as a patient progresses through various stages of treatment, several providers will be involved, such as primary care physicians and physician-extenders, neurologists, pain management physicians, and neurosurgeons, all operating as a cohesive interprofessional team. Pain psychologists are regularly utilized to assess any psychosocial barriers to improvement (as with any chronic pain condition), evaluate whether patients are suitable candidates for the more invasive procedures, and help guide patients through emotional aspects affecting care. Physical therapists or chiropractors may be utilized if there is a movement component associated with pain, and they can also address detrimental movement patterns that exacerbate the pain state. During interventional procedures, having a competent operating room staff including operating room nursing staff leads to better outcomes and can confer a comforting experience to the patient. With these interprofessional methods, open communication and data sharing, and coordinated effort between various disciplines, patients will experience improved outcomes. [Level 5]
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