Supraorbital neuralgia after an injury to the eyebrow

A blow to the eyebrow can leave a headache behind long after the bruise has gone. If your forehead pain is always on the same side, sits above one eye, and you can find a tender spot on the brow ridge, this is a specific and treatable diagnosis rather than an unexplained headache.

The nerve, and where it is vulnerable

The supraorbital nerve is a branch of the first division of the trigeminal nerve. It leaves the skull through the supraorbital notch or foramen — a gap you can feel on the upper rim of the eye socket, roughly a third of the way out from the midline — and fans out to supply the forehead and the front of the scalp.

At that exit point it is close to the surface and lying against bone, with nothing over it but skin, muscle and eyebrow. A direct blow to the brow compresses the nerve against the orbital rim. That is the anatomy behind why this happens after an elbow in basketball, a fall onto the brow, a windshield or airbag impact, an assault, or a laceration repaired over the eyebrow. Surgery in the area, including brow lifts, can do the same thing.

What it feels like

Supraorbital neuralgia has a described diagnostic triad: forehead pain in the territory the nerve supplies, without switching sides; tenderness over the supraorbital notch or along the course of the nerve; and complete, though temporary, relief of the pain when the nerve is blocked with local anesthetic.¹

In a series of 18 patients followed over seven years, the pain was typically dull with short sharp or burning exacerbations, sitting in the forehead and around the eye. Five of the 18 had a history of trauma to the forehead on the same side. About two-thirds were women, average age at onset was 51.6 years, and by the time they were studied they had been in pain for an average of 5.9 years.²

Two features point specifically toward a nerve injury rather than a primary headache:

• It never changes sides. Migraine can favor one side but generally shifts at least occasionally. A pain rigidly locked to one side of the forehead over years is doing something different.
• The skin over it behaves oddly. Numbness, pins and needles, or a forehead that hurts to light touch or to the brush of a hairbrush. Around half the cases identified in a population study had measurable sensory loss on the affected side.³ These sensory features, and sharp jabbing pains, are reported more often in the post-traumatic form than in cases with no injury behind them.¹

How common is it, really

The literature describes supraorbital neuralgia as rare, and in headache clinics it is diagnosed rarely. A population study points the other way. Among 1,838 residents aged 18 to 65 in Vågå, Norway — 88.6% of those eligible — ten met the case definition, a prevalence of about 0.5%.³

The case definition used in that study is worth reading closely, because trauma was built into it: unilateral forehead or eye pain, steadfastly one-sided, with increased tenderness over the nerve’s exit point, and preceding trauma to the forehead or supraorbital rim on the same side.³

Half a percent of a general population is not rare. The likeliest reading of the gap is that the diagnosis is under-recognized rather than genuinely uncommon — people with a decades-old brow injury and a one-sided forehead headache are being carried under a different label. That is a single population, in one Norwegian valley, and the figure should be treated as one good estimate rather than a settled number.

What it is mistaken for

• Migraine. The overlap is real, and the two can coexist. Side-locking, a tender notch and sensory change on the forehead are the features that should prompt a second look — see migraine treatment.
• Sinus headache. Frontal pain above the eye is routinely attributed to the frontal sinus. See is it a sinus headache or a migraine.
• Cluster headache. Also strictly one-sided and centered around the eye, but with prominent tearing, nasal congestion and a striking circadian pattern that supraorbital neuralgia does not have — see migraine or cluster headache.
• Post-concussive headache. A blow hard enough to injure the nerve may also have caused a concussion, and both can be present. One does not exclude the other.
• Thyroid eye disease. In a review of 1,126 patients with thyroid eye disease, 8% reported a distinct pain suggestive of supraorbital neuralgia, and all of them had complete relief from a supraorbital nerve block.⁴ Worth knowing if there is eye protrusion or a thyroid history.

Why the block is the test as well as the treatment

There is no scan for this. The diagnosis is made from the pattern, the tender point, and the response to anesthetizing the nerve — complete relief while the anesthetic is working confirms that the pain is arising from that nerve.¹ A negative result is equally informative: it says the pain is coming from somewhere else, and the diagnosis moves on.

That is only true if the injectate reached the nerve. This is the reason every injection here is placed under imaging rather than by feel — see ultrasound and fluoroscopic guidance and why image guidance matters. A failed landmark block tells you nothing at all.

Medication tends to disappoint here. In the 18-patient series, trials of various drugs including migraine and anti-neuralgic agents gave only slight relief, while anesthetic block of the nerve gave absolute relief for as long as it lasted.² Relief frequently outlasts the pharmacology of the anesthetic, sometimes by weeks — see do nerve blocks for headache work and trigeminal nerve block.

For the minority who do not respond durably to blocks, other options exist in the literature. Pulsed radiofrequency applied to the supraorbital nerve under ultrasound in 22 patients with refractory disease produced at least 50% pain reduction in 77% at one and three months, 73% at six months, 64% at one year and 50% at two years, with mild upper-eyelid bruising in about a quarter and no serious complications.⁵ That is a small, single-arm study with no control group, so treat it as encouraging rather than established.

What to bring to the appointment

• When the injury happened, and what hit you. Decades ago still counts.
• Whether the pain has ever been on the other side. Be precise here; it carries more diagnostic weight than the severity.
• Whether the forehead skin on that side feels different — numb, tingling, or too sensitive.
• Anything already tried, including migraine treatments, and whether any of it helped.
• Any scar over the eyebrow, and any surgery in the area.

Common questions

My eyebrow injury was years ago. Can it still be the cause?

Yes. In one series the average time in pain before assessment was 5.9 years, and cases have been described far longer after the injury than that.² A remote injury is a reason to examine the nerve, not to dismiss it. Contact us with the history and we can tell you whether it is worth assessing.

How do I know if it is this and not migraine?

The strongest clue is that the pain never moves to the other side, combined with a tender spot on the brow ridge and altered sensation on that side of the forehead.¹ They can also coexist. See migraine or tension-type headache for how the primary headaches are separated from each other.

Does the diagnostic block hurt, and will I need sedation?

No sedation, and you drive yourself home. It is a superficial injection over the brow ridge and takes seconds. What to expect from a nerve block describes the same process at the back of the head.

What if the block does not help at all?

Then, provided it was image-guided, that is a useful result rather than a wasted visit — it means the pain is not arising from that nerve and the diagnosis moves elsewhere. See why image guidance matters.

Will the numbness on my forehead come back?

Sensory loss from the original injury may or may not recover, and treating the pain does not necessarily restore sensation. The anesthetic itself produces temporary numbness over the forehead that wears off in hours, which is the expected effect of blocking that nerve — see trigeminal nerve block.

Sources

1. Pareja JA, Caminero AB. Supraorbital neuralgia. Curr Pain Headache Rep. 2006;10(4):302-305. doi:10.1007/s11916-006-0036-9
2. Caminero AB, Pareja JA. Supraorbital neuralgia: a clinical study. Cephalalgia. 2001;21(3):216-223. doi:10.1046/j.1468-2982.2001.00190.x
3. Sjaastad O, Petersen HC, Bakketeig LS. Supraorbital neuralgia. Vågå study of headache epidemiology. Cephalalgia. 2005;25(4):296-304. doi:10.1111/j.1468-2982.2004.00856.x
4. Patrinely JR, Hamilton KL, Parke RB, Patrinely JR, Soparkar CNS. Supraorbital neuralgia associated with thyroid eye disease. Ophthalmic Plast Reconstr Surg. 2021;37(3):230-235. doi:10.1097/IOP.0000000000001762
5. Luo F, Lu J, Ji N. Treatment of refractory idiopathic supraorbital neuralgia using percutaneous pulsed radiofrequency. Pain Pract. 2018;18(7):871-878. doi:10.1111/papr.12687