Trigeminal neuralgia affects roughly 25 out of every 100,000 people per year, making it relatively rare but far from unheard of. The lifetime prevalence sits at about 108 per 100,000, meaning roughly 1 in every 1,000 people will experience it at some point. A 2025 meta-analysis published in the Journal of Clinical Neurology, pooling eight decades of global data, confirmed these numbers and suggested the condition’s overall burden is larger than previously estimated.
Who Gets It Most Often
Trigeminal neuralgia is not evenly distributed across the population. Women are affected more often than men, at a ratio of roughly 3 to 2. The condition becomes increasingly common with age, with most people first developing symptoms between 53 and 57 years old, though cases have been documented in adults as young as 24 and as old as 93.
High blood pressure also appears to raise the risk. A population-based study in the journal Neurology found that people with hypertension had about a 50% higher rate of developing trigeminal neuralgia compared to those without it (35.2 versus 23.2 cases per 100,000 person-years). The connection likely involves the effect of chronically elevated blood pressure on the blood vessels near the trigeminal nerve.
The Multiple Sclerosis Connection
People with multiple sclerosis (MS) develop trigeminal neuralgia at a much higher rate than the general population. A systematic review of over 30,000 MS patients found that about 3.4% of them had trigeminal neuralgia, with rates ranging from under 1% to nearly 10% depending on the study. That’s roughly 30 to 40 times the rate seen in the general population. In MS, the nerve damage stems from the disease itself stripping away the protective coating on nerve fibers, rather than from the blood vessel compression that causes most cases.
What Causes It
In the majority of cases, trigeminal neuralgia happens when a blood vessel presses against the trigeminal nerve near the brainstem. MRI studies show that about 57% of patients have visible arterial compression on the side where their pain occurs. Over time, this pressure wears down the nerve’s insulating sheath, causing it to misfire and send intense pain signals in response to ordinary sensations.
Not every case has an obvious structural cause, though. Some patients show no visible compression on imaging, and the condition can also arise from tumors, cysts, or nerve damage from other diseases like MS. Current classification systems distinguish between “classical” trigeminal neuralgia (caused by vascular compression), cases linked to another underlying condition, and “idiopathic” cases where no cause can be identified.
Why It’s Often Misdiagnosed
Despite its distinctive pain pattern, trigeminal neuralgia is frequently mistaken for a dental problem. The pain often strikes the lower face and jaw, exactly where a toothache would. In one survey of 117 trigeminal neuralgia patients, nearly 42% had undergone a dental procedure before receiving the correct diagnosis. An earlier study from Zurich found even higher numbers: 73% of patients had visited a dentist first, and 48% had at least one tooth extracted unnecessarily.
This pattern of misdiagnosis can add months or years of suffering and irreversible dental work. The key difference is that trigeminal neuralgia pain comes in sudden, intense bursts lasting from a fraction of a second up to two minutes. It feels electric, shooting, or stabbing, and is triggered by everyday actions like chewing, brushing teeth, talking, or even a light breeze on the face. Dental pain, by contrast, tends to be a steady ache that worsens with pressure or temperature.
How It’s Recognized
Diagnosis is based primarily on the pain’s characteristics. The International Headache Society’s criteria require all of the following: the pain must be on one side of the face, confined to the area served by the trigeminal nerve. It must be severe, electric shock-like or stabbing, and last between a fraction of a second and two minutes per episode. It must be set off by harmless stimuli like touching the face or chewing. And no other diagnosis should better explain the symptoms.
There’s no blood test or single scan that confirms trigeminal neuralgia. MRI is used mainly to look for underlying causes, like a compressing blood vessel, a tumor, or signs of MS. The diagnosis ultimately rests on the clinical picture, which is why seeing a neurologist familiar with the condition matters. Many patients cycle through dentists, ENT specialists, and primary care physicians before landing on the correct diagnosis.
How Common Compared to Similar Conditions
To put the numbers in perspective, trigeminal neuralgia is roughly 10 times less common than conditions like Bell’s palsy (which affects about 15 to 30 per 100,000 annually) but far more common than many other cranial nerve disorders. It is, however, the most common form of facial neuralgia. With an estimated lifetime prevalence of about 1 in 1,000, most primary care doctors will encounter several cases over the course of their career, yet the condition remains unfamiliar enough that initial misdiagnosis is the norm rather than the exception.
If you’re experiencing sudden, severe, one-sided facial pain that comes in brief jolts triggered by routine activities, those symptoms align closely with trigeminal neuralgia’s well-defined pattern. A neurologist can typically distinguish it from other causes of facial pain based on the characteristics of your episodes alone.