A sudden, severe pain in one side of the face — like an electric shock, gone in seconds — that can be triggered by something as ordinary as brushing your teeth, talking, or a draught of cold air. That description usually points to trigeminal neuralgia, one of the most intense forms of pain treated in neurology.
What is the trigeminal nerve?
The trigeminal nerve is responsible for sensation in the face — forehead, cheek and jaw. It is called "trigeminal" because it divides into three main branches, each supplying a different area of one side of the face. It also contributes to the movement of the chewing muscles.
When the nerve becomes irritated or compressed, its signalling changes, and the brain interprets ordinary touch as severe pain. That is why a patient with trigeminal neuralgia can be hurt by something as simple as eating or shaving.
Symptoms of trigeminal neuralgia
- Sudden, sharp pain in one side of the face, often described as an electric shock or a stabbing sensation.
- Each episode is brief — seconds to a couple of minutes — but extremely intense while it lasts.
- The pain is usually one-sided, and only rarely affects both sides.
- It is triggered by light stimuli: touching the face, brushing teeth, shaving, chewing, talking, or cold air.
- Attacks may repeat through the day, with completely pain-free intervals in between.
- Quiet periods can last weeks or months before symptoms return.
It is worth being clear that facial pain has many causes other than the trigeminal nerve — dental problems, sinus disease and jaw-joint disorders among them. Distinguishing between them requires medical assessment; not every facial pain is trigeminal neuralgia.
What causes it?
In most cases the cause is pressure from a blood vessel on the nerve where it leaves the brainstem, which over time irritates the nerve's protective covering. Less common causes include:
- Conditions affecting the nerve covering, such as multiple sclerosis.
- A tumour or abnormal formation pressing on the nerve's path.
- Previous facial injury or surgery in the area.
- In a proportion of cases, no definite cause is identified.
How is it diagnosed?
Diagnosis rests largely on the description of the pain — where it is, how long it lasts, what it feels like, and what triggers it. This is why the doctor asks detailed questions, and why an accurate account from the patient is so valuable.
The doctor may then request:
- A clinical neurological examination to assess facial sensation and muscle movement.
- An MRI scan, to exclude causes such as tumours or multiple sclerosis and to assess the relationship between blood vessels and the nerve.
- Referral to a dentist or ENT specialist if another cause of the pain is suspected.
Treatment options
Treatment escalates from the simplest option upwards, and the doctor decides what suits the case based on severity and response:
- Medication: the first line in most cases, prescribed and dose-adjusted by the treating doctor with follow-up. These medicines differ from ordinary painkillers, and following instructions matters.
- Minimally invasive procedures: interventions targeting the nerve to reduce transmission of the pain signal, an option for some patients who do not respond to medication or cannot continue it.
- Surgery: in suitable cases, most commonly a procedure aimed at separating the compressing blood vessel from the nerve. The decision is made by a neurosurgeon after full assessment and a discussion of benefits and risks with the patient.
An important caution: do not take any medication for facial pain on your own or on someone's recommendation, and never change or stop your dose without consulting your doctor — the medicines used here require medical supervision and monitoring.
Practical ways to cope with the pain
- Identify which triggers set off your attacks and reduce exposure to them where you can.
- Use warm rather than cold water for washing your face and brushing your teeth; cover your face outdoors if cold air is a trigger.
- Softer food is easier to chew during periods of frequent attacks.
- Keep a record of when attacks happen and how severe they are — it genuinely helps your doctor assess how well treatment is working.
- Chronic pain affects mood and sleep. Raising that with your doctor is part of treatment, not an afterthought.
When to go to the emergency department
- Sudden severe head or facial pain unlike anything before, particularly with vomiting or a change in consciousness.
- Sudden weakness of one side of the body or face, or a change in speech or vision.
- Fever together with facial swelling or redness.
- Persistent numbness or loss of sensation in the face (different from the episodic pain).
Town Hospital's emergency department is open 24 hours.
Frequently Asked Questions
Is trigeminal neuralgia dangerous?
The condition itself is not life-threatening, but the pain is severe and has a substantial effect on quality of life, eating and sleep. At the same time, other causes of the pain need to be excluded through medical assessment, which is why early diagnosis matters.
Can it be cured permanently?
Many patients achieve good control of the pain with appropriate treatment, but outcomes vary by case depending on the cause and how long symptoms have been present. Your doctor can explain what is realistic for your particular situation.
Is it the same as facial nerve palsy?
No — they are entirely different. The trigeminal nerve governs sensation in the face, and its symptom is pain. The facial nerve governs movement of the facial muscles, and its symptom is weakness or paralysis of movement, not pain.
Could my teeth be the cause?
The symptoms can overlap, and many patients undergo dental treatment before the correct diagnosis is reached. If pain continues after dental treatment, or no clear dental cause is found, a neurological assessment is worthwhile.
What should I bring to the first visit?
Any previous scans or MRI results, a list of your current medications, and a written description of the pain: exactly where it is, how long it lasts, what it feels like, and what triggers it. That description matters more to the diagnosis than any single test.
Surgical consultation
If you need a surgical opinion on your case, you can book with Dr Ahmed El Ghannam, Neurosurgery Consultant at Town Hospital — Fifth Settlement, New Cairo. To book or ask a question: WhatsApp or call 15276.