Trigeminal neuralgia | |
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Other names | Tic douloureux,[1] prosopalgia,[2] Fothergill's disease,[3] |
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The trigeminal nerve and its three major divisions (shown in yellow): the ophthalmic nerve (V1), the maxillary nerve (V2), and the mandibular nerve (V3) | |
Specialty | Neurology |
Symptoms | Typical: episodes of severe, sudden, shock-like pain in one side of the face that lasts for seconds to minutes[1] Atypical: constant burning pain[1] |
Complications | Depression[4] |
Usual onset | > 50 years old[1] |
Types | Typical and atypical trigeminal neuralgia[1] |
Causes | Believed to be due to problems with myelin of trigeminal nerve[1][5] |
Diagnostic method | Based on symptoms[1] |
Differential diagnosis | Postherpetic neuralgia[1] |
Treatment | Medication, surgery[1] |
Medication | Carbamazepine, oxcarbazepine[5] |
Prognosis | 80% improve with initial treatment[5] |
Frequency | 1 in 8,000 people per year[1] |
Trigeminal neuralgia (TN or TGN), also called Fothergill disease, tic douloureux, trifacial neuralgia, is a long-term pain disorder that affects the trigeminal nerve,[6][1] the nerve responsible for sensation in the face and motor functions such as biting and chewing. It is a form of neuropathic pain.[7] There are two main types: typical and atypical trigeminal neuralgia.[1]
The typical form results in episodes of severe, sudden, shock-like pain in one side of the face that lasts for seconds to a few minutes. Groups of these episodes can occur over a few hours. The atypical form results in a constant burning pain that is less severe. Episodes may be triggered by any touch to the face.[1] Both forms may occur in the same person. Pain from the disease has been linked to mental health issues, especially depression.[4]
The exact cause is unknown, but believed to involve loss of the myelin of the trigeminal nerve.[5] This might occur due to nerve compression from a blood vessel as the nerve exits the brain stem, multiple sclerosis, stroke, or trauma. Less common causes include a tumor or arteriovenous malformation. It is a type of nerve pain. Diagnosis is typically based on the symptoms, after ruling out other possible causes such as postherpetic neuralgia.[7][1]
Treatment includes medication or surgery. The anticonvulsant carbamazepine or oxcarbazepine is usually the initial treatment, and is effective in about 90% of people.[7] Side effects are frequently experienced that necessitate drug withdrawal in as many as 23% of patients.[7] Other options include lamotrigine, baclofen, gabapentin, amitriptyline and pimozide.[5] Opioids are not usually effective in the typical form. In those who do not improve or become resistant to other measures, a number of types of surgery may be tried.[5][1]
It is estimated that trigeminal neuralgia affects around 0.03% to 0.3% of people around the world with a female over-representation around a 3:1 ratio between women and men.[8] It usually begins in people over 50 years old, but can occur at any age.[1] The condition was first described in detail in 1773 by John Fothergill.[9]
prosopalgia.