An occipital nerve block is an injection of numbing medication, sometimes combined with a steroid, into the back of the head near the base of the skull. It targets the occipital nerves that supply sensation to the rear and top of the scalp, and it’s used to treat and diagnose several types of headaches. In studies, 82% of patients reported moderate or significant pain reduction after the procedure.
How It Works
Three occipital nerves branch off from the upper spinal nerves in your neck (at the C2 and C3 vertebrae) and travel upward to supply feeling across the back of your scalp. When these nerves become irritated or inflamed, they can generate pain that radiates from the base of the skull toward the top of the head, behind the eyes, or across the temples.
The injection delivers a local anesthetic close to the affected nerve, temporarily blocking its ability to transmit pain signals. When a steroid is included, it reduces inflammation around the nerve, which can extend the duration of relief. There’s also a deeper reason the block works for headaches that seem to originate elsewhere in the head: the sensory fibers of the greater occipital nerve share a common pain-processing pathway with the trigeminal nerve, which is the main nerve involved in migraines and many other headache types. Blocking one end of that shared pathway can quiet pain signals traveling through the other.
Conditions It Treats
Occipital nerve blocks are used both as a first-line treatment and as a backup when other approaches haven’t worked. The most common conditions include:
- Occipital neuralgia: sharp, shooting pain that starts at the base of the skull and radiates upward along one side of the scalp.
- Migraines: the block can treat an active migraine and, for some people, help prevent future episodes. Clinical trials have shown it performs at least as well as standard IV migraine medications in emergency settings.
- Cluster headaches: severe, one-sided headaches that occur in cycles. Adding a steroid to the injection is particularly effective for this type.
- Cervicogenic headaches: headaches originating from problems in the neck. Steroid combined with anesthetic provides the best results here.
- Post-dural puncture headaches: headaches that develop after a spinal tap or epidural. Again, the steroid component makes a meaningful difference for this condition.
One practical detail worth knowing: for migraines specifically, research shows no real difference in pain control between anesthetic alone and anesthetic plus steroid. But for cluster headaches, cervicogenic headaches, and post-dural puncture headaches, the addition of a steroid is clearly more effective.
What Happens During the Procedure
The injection itself typically takes only a few minutes. You’ll either sit upright with your head tilted forward (resting on your hands or a support) or lie face down on a table with a pillow under your chest to gently flex your neck. Both positions expose the back of the head and upper neck where the injection is placed.
Your provider will feel the back of your head and neck to locate the target nerve by touch, using bony landmarks at the base of the skull. In some cases, ultrasound or fluoroscopy (a type of live X-ray) helps guide the needle more precisely. After cleaning the skin with antiseptic, the provider inserts a small needle and injects the medication as close to the nerve as possible. If the injection is well placed, the scalp on that side of your head will go numb quickly, which is actually a good sign that the medication reached the right spot.
What to Expect Afterward
Recovery is minimal. Most people can drive themselves home after the procedure and return to normal daily activities by the following day. The numbness in your scalp typically wears off within a few hours as the anesthetic fades.
Pain relief from the anesthetic portion starts almost immediately, but it may take a few days for the steroid component (if used) to reach its full effect. How long the relief lasts varies widely. Some people experience weeks or months of reduced headache frequency and intensity, while others find the benefit more short-lived. Repeat injections can improve results: among patients who received two or more procedures, 74% rated their pain reduction as significant (more than a 50% decrease), compared to 36% of those who had only one injection.
Side Effects and Risks
Occipital nerve blocks are considered low-risk. The most common side effects are temporary and localized: soreness or tenderness at the injection site, brief numbness spreading across the scalp, and occasionally lightheadedness. Some people notice a small area of hair thinning near the injection site when steroids are used repeatedly, though this is usually temporary.
Rare complications include infection at the injection site, bleeding (particularly in people on blood thinners), and allergic reactions to the anesthetic. Damage to the nerve itself is uncommon. People with active skin infections near the injection site, known allergies to local anesthetics, or significant bleeding disorders may not be good candidates for the procedure.
Diagnostic Value
Beyond treating pain, an occipital nerve block also works as a diagnostic tool. If your headaches respond well to the injection, it confirms that the occipital nerves are involved in your pain, which helps narrow down the diagnosis and guide future treatment. If the block doesn’t help, your provider knows to look at other causes. This dual role, both treatment and test, makes it a particularly useful step early in the process of figuring out hard-to-pin-down headaches.