Nervous tic or trigeminal neuralgia is a chronic neuropathic disorder of the trigeminal nerve causing sudden, extreme pain in certain parts of the face.
Causes are not known but some of the possibilities include:
- Injury or trauma to the nerve
- Autoimmune disorders like multiple sclerosis
- Arteries or blood vessels causing compression
- Tumor causing compression
- Sudden, sharp, shock-like pain in the face, mostly on one side
- Pain lasting for a few seconds to a few minutes
- Pain triggered by even mild touch, chewing, drinking, etc.
- Medication like antiseizure drugs
- Surgical procedures to relieve pressure or prevent the pain signals from reaching the brain
Since the causes are not clear, there is no known way to prevent it.