Relating to or affecting one side of the face.
From Greek 'hemi-' (half) + 'facial' (from Latin 'facies,' meaning face). The term directly means 'half-faced' and describes conditions or features involving only one side of the face.
Hemifacial spasms happen when a nerve misfires and causes involuntary twitching on just one side of your face—it's a quirk of nervous system wiring that reveals how your left and right sides operate independently.
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