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The trigeminal nerve has three branches that innervate the forehead, cheek, and jaw — neuralgia pain always affects only one side.
Trigeminal neuralgia is the most intense chronic pain known to medicine, classified at the highest level of the McGill Pain Scale . It manifests as electric shocks in the face lasting a few seconds, triggered by talking, chewing, or even the wind. It is treatable: with lifestyle changes and, in severe cases, with medication or surgery.
Your face hurts. It’s not normal pain. It’s like a lightning bolt shooting through your cheek. Like electricity burning your jaw. It lasts seconds, but those seconds feel like hours.
And then it disappears. You’re left breathing heavily, wondering what just happened.
If this sounds familiar, you have a condition that almost no one diagnoses in time. It’s called trigeminal neuralgia . And it’s the most intense pain the human body can feel .
This isn’t exaggeration. Medical studies confirm it. On the McGill Pain Scale , trigeminal neuralgia is ranked as the most severe chronic pain known. More severe than cancer. More severe than a severe burn. Comparable only to amputation without anesthesia.
The good news: it’s treatable. But first you need to know WHAT’S happening to you.
What Is Trigeminal Neuralgia (Explained As If You Were a Child)
Your face has three main nerves that carry sensation—the trigeminal nerve . It is cranial nerve number 5. It is called “trigeminal” because it has three main branches that come out of the side of your face.
One branch rises towards the forehead and eyes. Another descends to the cheek. The third descends to the jaw and chin.
Normally, these nerves work well. They sense temperature, pain, pressure — everything functions properly.
But in trigeminal neuralgia, something goes wrong. The nerve becomes irritated. Or inflamed. Or it’s under pressure from a blood vessel rubbing against it. And when that happens, it sends erratic signals to the brain .
Your brain receives those signals and interprets them as EXTREME PAIN. But there’s no real injury. Your face is fine. The problem is that the nerve is sending the wrong information.
It’s like your face is plugged into an electrical outlet. But actually, the cable is damaged.
Where is the Trigeminal Nerve? (So you understand why it hurts there)
The trigeminal nerve originates in your brain—specifically, in your brainstem, which is the base of the brain. From there, it descends and divides into three branches.
Branch 1 (Ophthalmic): goes towards the eyes, forehead, and top of the head.
Branch 2 (Maxillary): goes towards the cheeks, nose, upper lip, upper teeth.
Branch 3 (Mandibular): goes towards the jaw, chin, lower teeth, tongue.
When you have neuralgia, it’s usually only ONE nerve branch that’s affected. That’s why the pain is on one side of the face—it’s not bilateral (on both sides).
According to the University of Navarra Clinic , the right side is more frequently affected (60%), and bilateral cases represent only between 1 and 6% of the total. In 90% of cases, the second or third branch of the nervous system is affected. The first branch is rarely involved (note this).
Comparative table: Trigeminal neuralgia vs. other common facial pains
Feature Trigeminal neuralgia Migraine Toothache Sinusitis
Duration of pain Seconds to 2 minutes 4 to 72 hours Continuous or pulsatile Persistent days
Type of pain Electric, sudden burst Pulsating, oppressive Dull or sharp Pressure, facial weight
Affected area One side of the face One side of the head Tooth or jaw Cheeks, forehead, nose
Trigger Touch, chew, wind Light, noise, stress Cold, heat, pressure Without a clear trigger
Between attacks Painless (in type 1) Painless Continuous pain Persistent discomfort
Usual diagnosis Neurologist + MRI Neurologist Dentist Clinical / ENT
Intensity (1–10) 9–10 / 10 6–8 / 10 5–7 / 10 4–6 / 10
The Symptoms (How to Know If You Have It)
Pain is the main characteristic. BUT it’s not just any pain. It’s specific: