Trigeminal neuralgia

presume you mean in a horse rather than human? It is used to describe the cause of headshaking which is believed to come from misfiring/pain in the trigeminal nerve.
 
In humans, very intensive but very brief 'lightning strike' pain. Can have a trigger point. Carbamezipine can be used as a diagnostic and can help to control it but has a lot of side effects.

OP - can you clarify what do you want to know?
 
More commonly know by the general term headshaking, the horse will usually twitch, flick or shake its head, often stopping to rub its nose on its leg and blowing, sneezing as if to clear an obstruction. They can get very distressed, become unrideable and even difficult to handle on the ground depending on severity.

It can be tested for by the vet nerve blocking and there are various treatments.

If you suspect it in your horse check everything else before giving up hope, I have had several in the yard that were considered to have it but not tested by nerve blocking.
One was suffering from a piece of tooth that was left by the dentist (it will cause no trouble:eek:) the owner was considering pts as he was so bad he has made a full recovery after 2 years of intermittent but progressively worse shaking that the vet considered to be T.N.
Another had been turned away for 2 years as so bad, he was treated with physio as he had been pinched by a badly fitting saddle, you could create the headshake in him by pressing his withers firmly 2 years on but he stopped completely otherwise and went on to BE.
Another had a sinus infection.
 
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