Why does a nerve at the back of the head cause pain behind the eye?

The greater occipital nerve is a branch of the second cervical root (the second nerve root in the neck). Inside the upper spinal cord, its fibers land on the same relay cells that receive the trigeminal nerve’s first branch. That branch serves the forehead and the eye. In the lab, stimulating the occipital nerve makes those shared cells more excitable to input from the lining of the brain. That wiring is why a headache can begin at the skull base and finish behind the eye. It is also why it gets labeled migraine for years while the neck goes unexamined.

What irritates the nerve is rarely one thing. The suboccipital muscles (the small muscles under the skull) that it passes through clamp down with constant tension. The upper neck joints they attach to degenerate (break down) and inflame. Sleep debt and a body running on metabolic inflammation lower the point at which any nerve fires. Then there is the commute: forty minutes each way on I-55/70 from Collinsville with the head pushed forward, or a forklift shift spent turning to look over the same shoulder. A rear-end crash at the Poplar Street merge can start the whole chain in a second. Two biological drivers, one behavioral, all closing in on a nerve the width of a shoelace.

How do you know if the occipital nerve is causing your headache?

The International Classification of Headache Disorders defines occipital neuralgia. It is shooting or stabbing pain in the area of the greater, lesser or third occipital nerve. The nerve is tender, and the pain gets relief from a local anesthetic block. The block is part of the definition. So before anything is injected, we press where each nerve crosses the skull base. If that brings on your headache, including the part behind the eye, the nerve is involved. If the neck joints bring it on instead, the diagnosis shifts toward cervicogenic headache and the block becomes a test of one part of the problem, not the whole answer.

What is an occipital nerve block, and when does the plan change?

Do occipital nerve blocks work?

The best randomized evidence is in migraine, not neuralgia. One study had 84 adults with chronic migraine. Weekly greater occipital nerve blocks with bupivacaine for a month cut monthly headache days from about 18 to 9. With saline, days went from 17 to 13. The saline group caught up once it was switched to the real drug. For cervicogenic headache the research is thinner. A 2021 systematic review found eight studies, 140 patients in total, none randomized. Pain relief lasted to about three months in the studies that looked that far. It faded by nine in the one that looked further.

Those studies cannot tell you who needs an occasional block, who needs the nerve treated for longer, and who needs the neck treated instead. That is because none of them followed patients long enough or sorted them by cause. Our position: your response to a well-placed block is your data. It is stronger than a population average. We read it alongside a plan that works on the posture, sleep and inflammatory tone that lower the nerve’s firing point. Roughly 40 to 50 percent of that plan is behavioral, with Acceptance and Commitment Therapy delivered in-house by a licensed, pain-trained clinician, because a headache that has run a schedule for years has trained the nervous system to expect it.

What happens during an occipital nerve block?

Risks, plainly: a sore scalp and a numb patch for a day or two. Some people feel lightheadedness during the injection, which is why you are seated or lying down. Repeated steroid can leave a small dent or pale spot in the skin at the site. That is one reason steroid is used sparingly and the block is not repeated forever without asking whether it is still the right tool.

Frequently asked questions

Could this be migraine and occipital neuralgia at the same time?

The two often show up together. The shared wiring means an irritated occipital nerve can lower the threshold for migraine attacks. That is why a block sometimes helps a headache that carries a migraine label. The condition itself is described on occipital neuralgia.

My headaches started after a rear-end collision. Is this relevant?

Headache after whiplash often comes from the occipital nerve or the upper neck. It is examined the same way, with the timeline and the findings written down. What to bring and how the record is built is on after a car accident.

How long does the relief last?

Anywhere from hours to months. That length of time is itself the next clue. Short relief that keeps coming back is the case for treating the nerve for longer. How a shrinking response is read is on when injections stop working.

What if the block does nothing?

Then the occipital nerve is not the driver. The workup turns to the upper neck joints and roots. It turns there rather than repeating a block that has already answered. The nerve-root version of neck-driven pain is on cervical radiculopathy.

How painful is an occipital nerve block?

It is a small injection beside the nerve at the base of the skull, done without sedation and finished in minutes, with ultrasound guidance where the anatomy calls for it. Afterward, expect a sore scalp and a numb patch for a day or two. The tender spot is pressed again in the room, so you know before you leave whether the headache responded.

What can go wrong with an occipital nerve block?

The risks are plain ones. Expect a sore scalp and a numb patch for a day or two. Some people feel lightheaded during the injection, which is why you are seated or lying down for it. With repeated steroid, the skin at the site can develop a small dent or pale spot, which is one reason steroid is used sparingly here.

How many times can you have an occipital nerve block?

There is no set number. The block is not repeated forever without asking whether it is still the right tool. Each block is a test as well as a treatment. How long the relief holds tells us what to do next. A block that reliably clears the headache and reliably wears off opens the door to radiofrequency treatment of the nerve or, for frequent severe headache, a small stimulator lead along it.

What kind of doctor does an occipital nerve block?

An interventional pain physician. This practice’s medical director, Dr. Gurpreet Singh Padda, MD, MBA, MHP, is an anesthesiologist and interventional pain physician licensed in Illinois and Missouri. The nerve is pressed at the skull base before anything is injected. So the block is aimed at an exam finding, not a guess. The result is recorded in the room before you leave.

Related reading

• Occipital neuralgia
• Cervical radiculopathy
• Radiofrequency ablation
• Peripheral nerve stimulation
• Sleep, movement and behavior