Of all the headache confusions, this one is the most consistent and the most consequential. Study after study examining people who self-diagnose or have been diagnosed with “sinus headache” finds that the large majority meet criteria for migraine instead.
The mislabelling sends people to antibiotics, decongestants and sometimes sinus surgery for a neurological condition that would respond to migraine treatment.
Why the confusion happens
It happens because migraine genuinely produces sinus symptoms.
The trigeminal nerve supplies the sinuses, nasal lining and much of the face. When the trigeminal system activates during a migraine, it produces parasympathetic outflow to those structures. The result is nasal congestion, runny nose, facial pressure, watery eyes and tenderness over the cheeks and forehead — the exact symptom set people associate with sinus infection.
Add that migraine attacks are frequently triggered by weather and barometric pressure changes, which people reasonably interpret as sinus-related, and the misattribution becomes almost inevitable.
Roughly nine in ten people presenting with self-described sinus headache turn out to have migraine on careful assessment.
How to tell them apart
Fever. A genuine bacterial sinus infection usually produces fever. Migraine does not.
Nasal discharge. Sinusitis produces thick, discoloured, purulent discharge. Migraine produces clear watery discharge or simple congestion.
Smell. Sinusitis commonly reduces or eliminates the sense of smell. Migraine does not.
Duration and course. Sinusitis persists continuously for days to weeks and follows an illness course. Migraine comes in discrete attacks lasting four to seventy-two hours with normal periods in between.
Nausea and light sensitivity. Present in migraine, not features of sinusitis.
Effect of activity. Migraine worsens with routine physical activity. Sinus pain is generally worse with bending forward but not specifically with exertion.
Throbbing quality. Characteristic of migraine.
Response to treatment. If triptans relieve it, it was migraine. If a decongestant helps temporarily, that proves little — decongestants constrict vessels and may partially relieve either.
A practical rule: no fever, no discoloured discharge, no loss of smell, but nausea or light sensitivity present — it is a migraine.
What migraine actually is
Migraine is neurogenic, not vascular. The older explanation — vessels constrict, then dilate, and dilation causes the pain — was superseded when blood flow studies found that headache frequently begins while cerebral blood flow is still reduced and does not track the later increase.
An attack involves activation of the trigeminovascular system, release of calcitonin gene-related peptide and related neuropeptides, sterile neurogenic inflammation, parasympathetic outflow producing exactly the facial and nasal symptoms described above, and progressive sensitization of brainstem neurons.
Understood this way, “sinus headache” symptoms are not a coincidence or an overlap. They are a direct product of the trigeminal-autonomic mechanism of migraine itself.
Where the upper cervical spine enters
The same trigeminal system that produces the facial symptoms receives input from the neck.
Sensory fibers from the upper three cervical nerve roots converge with trigeminal fibers onto shared second-order neurons in the upper spinal cord — the trigeminocervical complex, established neurophysiology. The brain cannot reliably distinguish where a signal arriving through that convergence originated. Dreyfuss, Michaelsen and Fletcher demonstrated the referral by provoking upper cervical joints in healthy volunteers and recording sensation in the occiput and head.
This means upper cervical input can be perceived not only as headache but as facial pressure and pain in the distribution people attribute to their sinuses. That is worth knowing for anyone who has had normal sinus imaging and still feels facial pressure.
When the atlas sits misaligned beneath the skull, mechanoreceptors report from a distorted position and the brainstem’s autonomic regulation operates on distorted information. Seaman and Winterstein described this as dysafferentation — abnormal mechanoreceptor input altering central processing, muscle tone and autonomic regulation. A coherent framework that has not been validated in controlled trials.
The proposal at proper strength: abnormal upper cervical input may act as a maintaining factor lowering the threshold for attacks, and may itself contribute to perceived facial symptoms through convergence. It does not cause migraine.
Three mechanisms require accurate labelling. Gary Hack and colleagues established the myodural bridge connecting the suboccipital muscles to the spinal dura — anatomically confirmed, clinically preliminary. Scott Rosa has published imaging observations and case series proposing craniocervical misalignment affects cerebrospinal fluid and venous flow; case-series and imaging work rather than controlled trials, using a proprietary patented method with commercially linked imaging, and a 2025 scoping review of weight-bearing MRI found only nine qualifying studies, mostly small feasibility reports. Michael Flanagan proposed the junction as a choke point affecting fluid circulation, venous drainage, arterial supply and brainstem regulation — a single-author hypothesis without controlled trial validation.
Why this matters practically
Repeated antibiotic courses for headaches that are not infections carry real costs — side effects, resistance, and years of untreated migraine. Sinus surgery performed for migraine misdiagnosed as sinus disease does not help, and it is not reversible.
Meanwhile migraine has specific effective treatments that go unused.
What to do
Track fever, discharge colour and sense of smell across several episodes. Their consistent absence is highly informative.
Ask specifically about migraine at your next appointment if you have been treated repeatedly for sinus headaches without lasting benefit.
Note that normal sinus imaging is a strong signal. If a CT shows healthy sinuses and you still get the facial pressure, sinusitis is not the explanation.
Genuine bacterial sinusitis needs medical treatment — this article is not an argument against treating real infections.
Upper cervical evaluation
Where neck involvement is suspected, evaluation begins with specific testing to determine whether a misalignment is present. Where indicated, cone beam CT three-dimensional imaging locates the exact pattern on that individual’s anatomy. The correction is gentle and precisely directed, made without popping, twisting or yanking the neck, with the approach oriented toward holding the correction and follow-up testing determining whether an adjustment is needed.
Stated fairly: upper cervical care has not been demonstrated superior to other approaches for migraine in head-to-head randomized trials.
Medical Disclaimer
This article is educational and does not constitute medical advice, diagnosis or treatment. Suspected sinus infection and persistent headaches both require medical evaluation. Seek emergency care immediately for sudden severe headache unlike any before, high fever with severe headache and neck stiffness, confusion, swelling or redness around the eye, vision changes, double vision, slurred speech, facial drooping, one-sided weakness, seizure, or loss of coordination.
Learn more about upper cervical evaluation and care at neckwise.com.
Written by Dr. Drew Hall, Upper Cervical Chiropractor.