By Dr Ho Kok Yuen, Pain Specialist
Medically reviewed: 11 March 2026
Trigeminal neuralgia (TN) is a condition that causes sudden, severe facial pain, often described as an electric shock affecting one side of the face. Even light activities such as brushing teeth, speaking, or touching the skin can trigger intense pain episodes.
Although the attacks are usually brief, the pain can be extremely distressing and may significantly affect eating, speaking, and daily activities.
Early evaluation by a pain specialist is important because effective treatments are available to control symptoms and improve quality of life.
What Is Trigeminal Neuralgia?
Trigeminal neuralgia is a disorder of the trigeminal nerve, the nerve responsible for sensation in the face.
This nerve has three branches:
- V1 (ophthalmic branch) – forehead and eye region
- V2 (maxillary branch) – cheek and upper jaw
- V3 (mandibular branch) – lower jaw and chin
Pain most commonly affects the V2 and V3 branches, causing severe pain in the cheek, upper teeth, jaw, or lips.
The pain is often described as:
- electric shock–like
- stabbing or shooting
- sudden and intense
Episodes usually last seconds to minutes but may recur many times during the day.
Symptoms of Trigeminal Neuralgia
Common symptoms include:
- sudden electric-shock facial pain
- stabbing or shooting pain in the cheek, jaw, lips, or teeth
- pain triggered by normal activities such as: brushing teeth, chewing, speaking, touching the face, shaving or exposure to wind
The pain usually occurs on one side of the face only.
Many patients initially believe the pain is due to dental problems, and may see a dentist before the correct diagnosis is made.
What Causes Trigeminal Neuralgia?
The most common cause is compression of the trigeminal nerve by a nearby blood vessel near the brainstem.
This pressure can damage the nerve’s protective coating (myelin), causing abnormal pain signals.
Less common causes include:
- multiple sclerosis
- tumours affecting the nerve
- vascular malformations
- previous nerve injury
In some cases, no clear cause is identified.
How Trigeminal Neuralgia Is Diagnosed
Diagnosis is usually based on the typical pattern of facial pain.
Your doctor will ask about: location of pain, triggers, duration of attacks and previous dental or medical treatments
An MRI scan of the brain is often performed to: identify nerve compression, exclude tumours or other neurological conditions and evaluate the trigeminal nerve.
Accurate diagnosis is important because other conditions can mimic trigeminal neuralgia, including:
- dental disease
- sinus disorders
- temporomandibular joint problems
- atypical facial pain
Treatment Options for Trigeminal Neuralgia
Medications
Medications are usually the first line of treatment. These drugs stabilise nerve activity and reduce abnormal pain signals.
Common medications include:
- carbamazepine
- gabapentin
- pregabalin
- baclofen
While medications can be effective, some patients develop side effects or reduced effectiveness over time.
Botulinum toxin (Botox) injections are increasingly used as a treatment option for trigeminal neuralgia, particularly in patients whose pain is not adequately controlled with medication. Small doses of botulinum toxin are injected into the painful facial areas along the affected trigeminal nerve branches.
Interventional Pain Procedures
In selected patients, minimally invasive procedures may help interrupt pain signals from the trigeminal nerve.
These include:
Trigeminal Nerve Blocks: injection treatments that temporarily reduce nerve irritation.
Radiofrequency Ablation: a procedure that uses controlled heat to interrupt pain signals from the trigeminal nerve. These treatments may provide significant relief in selected patients.
Surgical Treatment
Microvascular Decompression: this surgery relieves pressure on the trigeminal nerve by repositioning the compressing blood vessel. Microvascular decompression can provide long-term pain relief in appropriate patients.
FREQUENTLY ASKED QUESTIONS
When Should You See a Pain Specialist?
You should seek specialist evaluation if:
- facial pain is severe or recurring
- medications are no longer effective
- pain interferes with eating or speaking
- the diagnosis of facial pain is uncertain
Early assessment can help determine the cause of facial pain and guide appropriate treatment.
What triggers trigeminal neuralgia pain?
Common triggers include touching the face, brushing teeth, chewing, speaking, shaving, or exposure to cold wind.
Can trigeminal neuralgia be mistaken for dental pain?
Yes. Many patients initially believe the pain is caused by a tooth problem because the pain may involve the jaw or teeth.
Can botulinum toxin help trigeminal neuralgia?
Botulinum toxin injections may help reduce pain intensity and attack frequency in some patients with trigeminal neuralgia, particularly when medications are not effective or cause side effects.
Is surgery always required?
No. Many patients achieve good pain control with medications, botulinum toxin injections, or minimally invasive procedures.
If you are experiencing symptoms of trigeminal neuralgia, early evaluation by a pain specialist can help confirm the diagnosis and determine appropriate treatment options. Treatment may include medication management, botulinum toxin injections, minimally invasive procedures, or referral for surgical evaluation when necessary.