Trigeminal neuralgia is rare. The global incidence is roughly 22 new cases per 100,000 people per year in males and 44 per 100,000 in females, making it an uncommon but not extremely rare condition. To put that in perspective, in a city of 100,000 people, you’d expect somewhere between 20 and 45 new cases each year depending on the population’s age and sex distribution.
Who Gets It Most Often
Trigeminal neuralgia overwhelmingly affects older adults. While it can strike at any age, peak onset is typically after 50, and the condition becomes more common as populations age. Women are roughly twice as likely to develop it as men, a gap that holds across global data. The reasons for this sex difference aren’t fully settled, but the pattern is consistent enough to be considered a defining feature of the condition’s epidemiology.
Bilateral cases, where pain affects both sides of the face, are genuinely rare within an already uncommon condition. Only about 1.7% to 5% of people with trigeminal neuralgia experience pain on both sides, and even then it’s usually alternating rather than simultaneous.
Why It’s Often Mistaken for a Dental Problem
The pain of trigeminal neuralgia hits the face in regions served by the trigeminal nerve, which also supplies sensation to the teeth, gums, and jaw. Because of this overlap, over 40% of people who are eventually diagnosed with trigeminal neuralgia first seek care in a dental office. Many undergo unnecessary dental procedures, including root canals or extractions, before the real cause is identified.
This matters because trigeminal neuralgia pain is distinctive once you know what to look for: sudden, electric-shock-like jolts lasting seconds to two minutes, triggered by everyday actions like chewing, brushing teeth, or a breeze on the face. It’s almost always one-sided. If you’ve had repeated dental work on teeth that look healthy on imaging and the pain keeps coming back, trigeminal neuralgia is worth considering.
Three Types, One Condition
Doctors classify trigeminal neuralgia into three categories based on the underlying cause. Classical trigeminal neuralgia is the most common and happens when a blood vessel compresses the trigeminal nerve root, causing visible structural changes that can be confirmed on MRI or during surgery. Secondary trigeminal neuralgia results from an identifiable underlying disease, most notably multiple sclerosis. Idiopathic trigeminal neuralgia is the label used when all testing comes back normal and no cause can be found.
The connection to multiple sclerosis is notable. In a large survey of over 8,500 people with MS, nearly 10% also had trigeminal neuralgia. In 15% of those cases, the facial pain actually appeared before the MS diagnosis, meaning trigeminal neuralgia was the first sign of a condition they didn’t yet know they had. This is one reason doctors will sometimes order brain imaging even when trigeminal neuralgia seems straightforward, particularly in younger patients where the condition is less expected.
What the Pain Actually Feels Like
Trigeminal neuralgia is sometimes called the “suicide disease” because of the severity of the pain, which many patients describe as the worst they’ve ever experienced. Episodes come as sudden bursts of sharp, stabbing, or electric-shock pain on one side of the face. They can last from a fraction of a second to about two minutes. Between attacks, there may be no pain at all, or some people experience a dull, continuous ache in the background.
Common triggers include touching the face, eating, talking, brushing teeth, shaving, or even a light wind. Some people develop specific trigger zones on the face where even gentle contact sets off an attack. The unpredictability of attacks can lead people to avoid eating or talking, which takes a serious toll on daily life and mental health.
How It’s Treated
First-line treatment is medication that calms overactive nerve signals. For many people, this provides significant relief, at least initially. Over time, though, some find that medication becomes less effective or causes side effects like dizziness and fatigue that are hard to tolerate.
When medication stops working, surgery becomes an option. The most established procedure, microvascular decompression, physically moves the blood vessel away from the nerve. It has a cure rate of 80% to 98%, which is high for a chronic pain condition. The trade-off is that it’s open brain surgery requiring general anesthesia, and the recurrence rate over the long term is 10% to 30%. In one study tracking outcomes, the median pain-free period after the procedure was 12 months before some patients experienced a return of symptoms. For those whose pain does come back, a second surgery can still help, though the odds of complete relief are somewhat lower, with about 53% achieving excellent outcomes compared to 77% after the first procedure.
Less invasive options exist as well, including procedures that intentionally damage the nerve to interrupt pain signals and focused radiation treatments. These carry lower surgical risk but also lower long-term success rates and may cause facial numbness as a side effect.
Rare but Not as Rare as You Might Think
Trigeminal neuralgia falls into a category of conditions that are uncommon enough that many general practitioners see only a few cases in their careers, but common enough that most neurologists encounter it regularly. The combination of its rarity, its overlap with dental pain, and its dramatic severity means many people live with it for months or years before getting the right diagnosis. If you’re experiencing recurrent, one-sided facial pain that comes in short, intense bursts, especially if dental evaluations haven’t found a clear cause, it’s a diagnosis worth raising with your doctor.