A nerve block in the neck is an injection of numbing medication, sometimes combined with a steroid, near specific nerves in the cervical spine to stop pain signals from traveling to the brain. It can serve as both a treatment for chronic pain and a diagnostic tool to pinpoint exactly which nerve is causing the problem. Several types exist, each targeting different nerve structures depending on where your pain originates.
Types of Neck Nerve Blocks
The neck contains a dense network of nerves, and the type of block you receive depends on which ones are involved. The most common categories are cervical plexus blocks, medial branch blocks, occipital nerve blocks, and stellate ganglion blocks. Each targets a different structure and treats different conditions.
A cervical plexus block targets the nerve fibers formed by the upper four spinal nerves (C1 through C4), which supply sensation to much of the head and neck. This block comes in three depths: superficial, intermediate, and deep. A superficial block involves a shallow injection just under the skin and carries the fewest risks. A deep block reaches closer to the spine itself, essentially working as a paravertebral injection at individual nerve roots. Cervical plexus blocks are commonly used for surgical procedures on the head and neck, such as carotid artery surgery or lymph node removal.
A medial branch block targets the tiny nerves that carry pain signals from the facet joints, the small joints that connect each vertebra. These blocks are frequently used both to treat chronic neck pain and to confirm that the facet joints are the source before considering a longer-lasting procedure like radiofrequency ablation, which uses heat to disable the nerve.
A greater occipital nerve block targets the nerve at the base of the skull and is primarily used for migraines and chronic headaches. In a study of 78 migraine patients, those who received repeated occipital nerve blocks saw their monthly attack frequency drop from roughly 16 episodes to about 5 within three months. Headache duration also fell by more than half. These results held even for patients who hadn’t responded to preventive medications.
A stellate ganglion block targets a cluster of sympathetic (involuntary) nerve tissue near the base of the neck, at the level of the C7 vertebra. This block treats a wider range of conditions than you might expect: complex regional pain syndrome in the head and upper limbs, nerve pain following shingles, cluster headaches, and even post-traumatic stress disorder, where the block appears to have a calming effect on the body’s fight-or-flight system.
How the Procedure Works
Most neck nerve blocks are performed as outpatient procedures, meaning you go home the same day. You’ll typically lie on your back or sit upright depending on the injection site. The skin over the injection area is cleaned and numbed with a small amount of local anesthetic, so the main injection itself is more pressure than sharp pain.
The doctor guides the needle using real-time imaging, most often ultrasound, which shows soft tissue, muscles, and blood vessels on a screen. Some blocks, particularly deeper ones near the spine, may use fluoroscopy (a type of live X-ray) instead. This imaging guidance is critical in the neck because major arteries, the spinal cord, and the airway are all in close proximity. In a large study of over 800 cervical nerve root blocks, 799 were successfully completed without repositioning issues.
Once the needle is in position, the doctor injects a small volume of medication, usually between 2 and 6 milliliters. The whole procedure typically takes 15 to 30 minutes, though you’ll stay for monitoring afterward.
What Gets Injected
The injection typically contains a local anesthetic, which numbs the nerve and provides immediate but temporary relief. Bupivacaine is one of the most commonly used options. Local anesthetics work through several mechanisms at once: they suppress pain signals, block the sympathetic reflex arc that can amplify pain, and even have mild anti-inflammatory effects of their own.
Many blocks also include a corticosteroid, which reduces inflammation around the nerve. The steroid works by limiting the body’s inflammatory response, stabilizing cell membranes, and reducing the release of chemicals that sensitize nerve endings. When a block is purely diagnostic (the goal is to identify the pain source rather than treat it long-term), the injection may contain only anesthetic without a steroid.
Diagnostic vs. Therapeutic Blocks
One of the most important things to understand is that neck nerve blocks serve two distinct purposes. A diagnostic block uses a small amount of anesthetic to temporarily numb a specific nerve. If your pain disappears during those few hours of numbness, your doctor now knows exactly which nerve or joint is responsible. This is especially common with medial branch blocks: in one study of 100 patients with chronic neck pain, controlled diagnostic blocks confirmed facet joint involvement before any longer-term treatment was offered.
A therapeutic block, on the other hand, aims to provide lasting relief. It usually combines anesthetic with a steroid to reduce inflammation over weeks or months. Sometimes a series of therapeutic blocks is needed to achieve sustained improvement.
When Relief Kicks In and How Long It Lasts
You’ll likely notice numbness within minutes of the injection as the local anesthetic takes effect. This immediate relief typically lasts several hours. If a steroid was included, it takes a separate, slower path: the anti-inflammatory effect generally builds over 7 to 10 days before you feel the full benefit.
How long the therapeutic effect lasts varies widely. Some people experience weeks of relief, others several months. For conditions like facet joint pain, patients who respond well to initial blocks often return for repeat injections or move on to radiofrequency ablation for longer-lasting results. Occipital nerve blocks for migraines showed sustained improvements at the three-month mark in clinical studies, with patients receiving a series of repeated injections.
Risks and Side Effects
Neck nerve blocks are considered safe when performed with imaging guidance, but the neck is a complex area and some side effects do occur. In a prospective study of nearly 800 cervical nerve root blocks, there were no serious complications, including no strokes, spinal cord injuries, infections, or permanent nerve damage.
The most common minor complication was vasovagal symptoms: feeling lightheaded, nauseous, or briefly fainting. This is a reaction to the needle itself rather than the medication and resolves quickly. Six patients in that same study experienced temporary sympathetic blockade, which caused a drooping eyelid and a constricted pupil on one side (known as Horner’s syndrome). This happened most often with injections at the C6 and C7 levels and resolved on its own without lasting effects.
Rare but serious risks include accidental injection into an artery, vascular injury, or direct nerve damage from the needle. These are the primary reasons imaging guidance is standard practice for cervical blocks rather than relying on anatomical landmarks alone.
What to Expect After the Procedure
You should plan to limit your activities for the first 24 hours. Soreness at the injection site is normal and can last 2 to 4 days. Avoid soaking the injection site during that first day, so skip baths, hot tubs, and swimming pools. Showers are fine.
Depending on which nerves were targeted, you may notice temporary changes in sensation, skin color, or temperature in your arm or hand on the side of the injection. This is particularly common with stellate ganglion blocks and sympathetic blocks, and it typically fades within a few hours. You’ll also need someone to drive you home, since the numbness and any lingering sedation make it unsafe to drive immediately after the procedure.
Your doctor will usually ask you to track your pain levels carefully in the hours and days following the injection. This information is especially important if the block was diagnostic, since the pattern of when your pain returned helps confirm which nerve structure is involved and guides the next steps in your treatment plan.