Trigeminal neuralgia is a chronic pain condition that causes sudden, intense episodes of facial pain that can feel like an electric shock striking one side of the face. Simple daily activities such as brushing teeth, eating, or even feeling a gentle breeze can trigger these severe pain attacks, making this condition both physically and emotionally devastating for those who experience it.

Understanding Trigeminal Neuralgia

Trigeminal neuralgia, also known as tic douloureux (a French term meaning “painful tic”), is a condition that affects the trigeminal nerve, which is the nerve responsible for carrying sensation signals from the face to the brain. This nerve has three main branches that provide feeling to different parts of the face: the upper branch supplies sensation to the forehead and front of the head, the middle branch serves the cheek and upper jaw, and the lower branch provides feeling to the lower jaw and mouth area.^[1]

The pain associated with trigeminal neuralgia is often described as one of the most severe types of pain a person can experience. Some medical professionals have even called it “the most excruciating pain known to humanity.”^[4] The condition is sometimes referred to as “suicide syndrome” because the intensity of the pain has driven some individuals to consider ending their lives when it becomes unbearable.^[9]

What makes trigeminal neuralgia particularly challenging is its unpredictability. The pain typically occurs in sudden attacks that can last anywhere from a few seconds to several minutes. These episodes can happen multiple times throughout the day, and while some people experience periods of remission where they have no pain, these pain-free intervals often become shorter over time.^[1]

Epidemiology: Who Gets Trigeminal Neuralgia

The exact number of people affected by trigeminal neuralgia is difficult to determine, but research suggests it is a relatively rare condition. Approximately 150,000 people in the United States receive a trigeminal neuralgia diagnosis each year.^[2] Various epidemiological studies have shown that the annual incidence is about four to five new patients per 100,000 people.^[9]

Trigeminal neuralgia shows clear patterns in who it affects. The condition is more common in women than in men, with studies showing a ratio of approximately 1.5 to 1.^[9] Age is another significant factor, as most cases develop after the age of 50. The highest incidence occurs between the ages of 50 and 70, and in 90% of cases, symptoms begin after age 40.^[9]

While trigeminal neuralgia predominantly affects older adults, it can occur at any age, including in children, though this is very rare.^[2] Most people who develop the condition are otherwise in good health, making the sudden onset of severe facial pain even more distressing and unexpected.

Causes of Trigeminal Neuralgia

Despite ongoing research, scientists still do not completely understand all the causes of trigeminal neuralgia. However, the medical community has identified several mechanisms that can lead to this painful condition. The pain occurs when the trigeminal nerve becomes irritated, damaged, or compressed in some way.^[2]

Healthcare providers categorize trigeminal neuralgia into different types based on what causes the nerve irritation. Primary trigeminal neuralgia, also called classic trigeminal neuralgia, is the most common type. This occurs when a blood vessel, usually an artery, puts pressure on the trigeminal nerve near where it enters the brainstem. In about 75% to 80% of cases involving blood vessel compression, the superior cerebellar artery is responsible.^[6]

The pressure from the blood vessel causes damage to the protective coating around the nerve, called the myelin sheath. This damage leads to abnormal nerve signaling, causing the nerve to send pain messages to the brain even when there is no actual injury or danger. Think of it like an electrical wire with damaged insulation that begins to short-circuit and send faulty signals.^[9]

Secondary trigeminal neuralgia happens when another medical condition damages or affects the trigeminal nerve. Multiple sclerosis is one such condition that can cause secondary trigeminal neuralgia. In multiple sclerosis, the body’s immune system attacks the myelin sheaths of nerves throughout the body, including the trigeminal nerve.^[2] Other causes of secondary trigeminal neuralgia include tumors pressing on the nerve, cysts, facial injuries, or blood vessel abnormalities called arteriovenous malformations.^[2]

Risk Factors

Several factors can increase a person’s likelihood of developing trigeminal neuralgia. The most significant risk factor is age, with people over 50 being much more likely to develop the condition than younger individuals.^[1] Being female also increases the risk, as women are more prone to developing trigeminal neuralgia than men.^[2]

Certain medical conditions can also elevate the risk of developing trigeminal neuralgia. People with multiple sclerosis are at higher risk because this autoimmune disease can damage the myelin sheath that protects the trigeminal nerve. When multiple sclerosis affects the trigeminal nerve, it can lead to the development of secondary trigeminal neuralgia.^[2]

Any condition that can cause compression of the trigeminal nerve increases the risk. This includes tumors in the area near the brainstem, blood vessel abnormalities, or structural issues that put pressure on the nerve. Previous facial trauma or injury may also contribute to the development of trigeminal neuralgia in some cases, though the exact relationship is not fully understood.^[2]

Symptoms of Trigeminal Neuralgia

The hallmark symptom of trigeminal neuralgia is sudden, severe facial pain. People with this condition often describe the pain as feeling like an electric shock, a stabbing sensation, or a shooting pain that strikes without warning. The pain is typically so intense that it can stop a person in their tracks and disrupt whatever they are doing.^[1]

The pain episodes can last anywhere from a few seconds to about two minutes. While individual attacks are brief, they can occur in rapid succession, sometimes continuing for up to two hours with only short breaks in between. During a severe episode, a person might experience dozens or even hundreds of pain attacks in a single day.^[2]

In most cases, trigeminal neuralgia affects only one side of the face. The pain usually occurs in the areas served by the middle or lower branches of the trigeminal nerve, meaning the cheek, jaw, teeth, gums, and lips are most commonly affected. Less frequently, the pain can affect the forehead and eye area. In very rare cases, both sides of the face can be affected, though typically not at the same time.^[3]

Between pain attacks, many people experience other uncomfortable sensations. These can include a burning feeling, throbbing, numbness, tingling, or a dull ache in the affected area.^[2] During pain attacks, some people also experience facial muscle spasms, which is why the condition was historically called “tic douloureux.”^[2]

What makes trigeminal neuralgia especially difficult to live with is that very ordinary activities can trigger the pain. Brushing teeth, washing the face, applying makeup, shaving, eating, drinking, talking, smiling, or simply touching the face can all bring on an attack. Even a light breeze or a gust of wind on the face can be enough to trigger severe pain.^[2] This unpredictability means that people with trigeminal neuralgia often live in fear of their next pain attack, not knowing what might set it off.

Healthcare providers recognize two main patterns of trigeminal neuralgia based on how symptoms present. Paroxysmal trigeminal neuralgia involves sharp, intense, and sporadic painful episodes with pain-free intervals in between. Trigeminal neuralgia with continuous pain, sometimes called atypical trigeminal neuralgia, involves more constant pain with stabbing or burning sensations along with persistent aches. This second type is often more difficult to manage.^[2]

One notable characteristic of trigeminal neuralgia is that pain attacks rarely occur during sleep. This pattern can help doctors distinguish trigeminal neuralgia from other types of facial pain conditions.^[2]

Prevention

Because the exact causes of trigeminal neuralgia are not fully understood, and because the primary type is caused by blood vessel compression that develops over time, there are no proven methods to prevent the condition from developing in the first place. However, for people who already have trigeminal neuralgia, identifying and avoiding personal pain triggers can help reduce the frequency of attacks.

Keeping a detailed diary of when pain attacks occur and what activities preceded them can help identify specific triggers. Once triggers are identified, people can take steps to minimize exposure to them. For example, if cold air triggers pain, wearing a scarf over the face when going outside in winter might help. If chewing triggers attacks, adjusting diet to include softer foods that require less chewing may reduce episodes.^[13]

Stress management may also play a role in reducing the frequency or severity of pain attacks. While stress does not cause trigeminal neuralgia, it can heighten nerve sensitivity and potentially trigger flare-ups. Relaxation techniques such as deep breathing, meditation, or gentle yoga may help calm the nervous system.^[18]

For people with secondary trigeminal neuralgia caused by multiple sclerosis, following treatment plans for the underlying condition may help prevent worsening of nerve damage and potentially reduce trigeminal neuralgia symptoms over time.

Pathophysiology: How the Body Changes

Understanding what happens in the body during trigeminal neuralgia helps explain why the pain is so severe and why it behaves the way it does. The trigeminal nerve is one of twelve pairs of cranial nerves that emerge directly from the brain. Unlike most nerves in the body that extend from the spinal cord, cranial nerves connect directly to the brain itself.^[3]

The trigeminal nerve has a unique structure. After leaving the brainstem, it divides into three distinct branches, which is why it is called “trigeminal” (meaning three twins). The first branch, called the ophthalmic nerve, provides sensation to the eyes, upper eyelid, and forehead. The second branch, the maxillary nerve, controls sensation in the lower eyelid, cheek, nostril, upper lip, and upper gums. The third branch, the mandibular nerve, provides sensation to the jaw, lower lip, lower gums, and some of the muscles used for chewing.^[4]

In primary trigeminal neuralgia, the most common scenario involves a blood vessel that loops near the trigeminal nerve at the point where the nerve enters the brainstem. This area is called the root entry zone. With each heartbeat, the blood vessel pulsates, creating repeated contact with the nerve. Over time, this constant pulsation can wear away the protective myelin coating that surrounds the nerve fibers.^[9]

When the myelin sheath is damaged, the nerve becomes vulnerable to abnormal electrical activity. The nerve can begin to fire spontaneously or respond to very mild stimulation with excessive signals. This is why even light touch can trigger severe pain in people with trigeminal neuralgia. The damaged nerve essentially malfunctions, sending intense pain signals to the brain even when there is no actual tissue damage or injury occurring.^[9]

Recent research has suggested that in some people with trigeminal neuralgia, especially those with more constant, atypical pain patterns, changes may occur not just in the nerve itself but also in how the brain processes pain signals. The central nervous system may develop an excessive response to trigeminal nerve input, amplifying pain signals beyond what would normally be expected. This is called central sensitization.^[9]

The pathophysiology also explains why trigeminal neuralgia can worsen over time. As nerve damage progresses, the pain attacks may become more frequent, last longer, and become more difficult to control with medication. The pain-free intervals between attacks often shorten as the condition advances.^[1]