Hemifacial spasm is believed to be due in part to compression of the facial nerve where it meets the brainstem. The compression can be cause by:
- A blood vessel pressing on the facial nerve (most frequent cause)
- Facial nerve injury
- Bony or other abnormalities that compress the nerve
Facial Nerve Innervation
The following factor increases your chance of developing hemifacial spasm:
- Being a middle-aged or elderly woman
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