An occipital nerve block is an injection of local anesthetic — often with a small dose of corticosteroid — placed over the greater occipital nerve at the back of the skull. It helps most in three situations: cluster headache, occipital neuralgia, and as a short bridge when someone is stuck in a bad stretch and can’t take much else. Relief typically lasts days to a few weeks, not months. It is not a preventive treatment, and it will not undo a headache that is being driven by daily painkillers. That distinction is where most of the disappointment comes from.
I had a patient last spring, a schoolteacher in her forties, who came in holding a printout about nerve blocks. She had read that they “cure” migraine. She had been having headaches nineteen or twenty days a month for two years, and she was taking a combination painkiller most mornings before her first class. I told her I was happy to do the injection — and that it would probably help for about ten days, after which we would be exactly where we started unless we dealt with the daily tablets. We did both. The block bought her the two weeks of relief she needed to get through the withdrawal period without quitting. On its own, it would have been a very expensive week of feeling better.
What the injection actually is
The greater occipital nerve runs up from the second cervical nerve root, through the muscles at the base of the skull, and fans out over the back and top of the head. It’s easy to reach — a superficial injection roughly a third of the way along a line between the bump at the back of the skull and the mastoid bone behind the ear. Most of us use lidocaine or bupivacaine. Whether to add a steroid depends on the diagnosis, and I’ll come back to that.
The interesting part is why an injection at the back of the head does anything for pain felt behind the eye or across the forehead. Occipital fibers converge with trigeminal fibers in the upper cervical spinal cord — the trigeminocervical complex. Numbing one input appears to quiet the whole pool of neurons for a while. That’s also the reason a block can help a headache that has nothing structurally wrong with the occipital nerve itself, and why the effect often outlasts the anesthetic by days or weeks. It’s modulation, not repair.
Where the evidence is strongest
Cluster headache. This is the clearest indication. Suboccipital injection of a corticosteroid, given at the start of a cluster bout, can suppress attacks while a preventive like verapamil is being titrated up to an effective dose. Randomized trial data support it, and headache societies list it as a transitional treatment. If you have cluster headache and no one has offered you this, it’s worth asking about specifically.
Occipital neuralgia. Here the block does double duty. If the pain is truly coming from an irritated occipital nerve, numbing it should abolish the pain within minutes. When it doesn’t, that is genuinely useful information — the diagnosis was probably wrong, and a great many people carrying an occipital neuralgia label actually have migraine with prominent posterior pain.
Bridge situations. A migraine that has gone on for days and won’t break. Pregnancy, where the oral options are narrow and a local anesthetic injection is comparatively attractive. Someone coming off overused analgesics who needs something to lean on for two weeks. In all of these the block is a bridge to somewhere, and the destination matters more than the bridge.
Where it disappoints people
For chronic migraine as a standalone treatment, the evidence is thinner than the enthusiasm. Trials are small, protocols differ wildly, and the placebo response to any injection is substantial. Some patients get four to six weeks of meaningful improvement. Others get three days. I can’t reliably predict which in advance, and I say so before we start.
The block also fails predictably in two groups. The first is anyone whose headache is being sustained by medication overuse. You can numb the nerve, but the underlying driver keeps working, and the headache reassembles itself as the anesthetic fades. The second is the patient whose neck is genuinely the source — facet joint or disc pain referring upward. That’s a different target, and I’ve written elsewhere about how often the neck gets blamed for headaches it isn’t causing.
A block is also not a substitute for a preventive. If you’re having headaches on more than about eight days a month, the real conversation is about daily prevention — and if you’ve already tried one that didn’t work, the question is usually dose and duration rather than the drug itself. I’ve covered that in when to switch a migraine preventive.
What the procedure is actually like
It takes under five minutes. You sit leaning slightly forward; the skin is cleaned; the injection stings for a few seconds and there is a brief pressure sensation. Within ten to fifteen minutes most of the back of the head goes numb, sometimes up to the crown, and that numbness wears off over several hours. Some people feel a wave of relief on the table. Others notice nothing that day and feel better the following morning.
Side effects are usually minor: soreness at the site for a day or two, transient lightheadedness, occasionally a brief worsening before improvement. The ones worth knowing about involve the steroid — repeated injections at the same spot can thin the skin or cause a small patch of hair loss and local fat atrophy, which is why I space them out and don’t use steroid at every visit. There is also one situation I always ask about: prior skull surgery or a bone defect in that area. Injecting over a craniotomy site is not something to do casually.
How often can it be repeated? There’s no firm ceiling, but if someone is coming back every three weeks for a block, that’s a signal the preventive plan isn’t working — not a reason to keep injecting.
Questions worth asking before you agree to one
Ask what the block is for in your particular case: diagnosis, bridge, or bout suppression. Ask whether steroid is being added and why. Ask what happens next if it works well but only for two weeks, and what happens if it does nothing at all — a doctor who has thought about both answers is a doctor with a plan. And if the honest answer is that nobody is sure what your diagnosis is, the injection is the wrong next step. Getting the label right comes first, which is the whole argument of why your headache isn’t getting better.
Used well, a nerve block is one of the more satisfying things I do — fast, cheap, low-risk, and occasionally dramatic. Used as a substitute for a diagnosis, it’s just a needle.
Not sure your headache has been correctly labeled? Start with the free red-flag checklist: Headache Red Flags — Free Checklist.
Want a neurologist’s read on your case? Talk to a specialist.
Written by Dr. Tae-Ho Guak, MD, board-certified neurologist with 25 years and over 100,000 patient consultations. This article is for education only and does not replace an evaluation by your own physician. If you have a sudden severe headache, a headache with fever and neck stiffness, weakness, confusion, or vision loss, go to an emergency department immediately.
From the textbook. Chapter 50, “Occipital Neuralgia and the Greater Occipital Nerve Block,” of my clinical textbook Headache Medicine covers this topic in full for doctors, with the evidence and decision pathways behind it. About the book →