A medical condition involving involuntary muscle contractions or spasms affecting one side of the body or face.
From Greek 'hemi-' (half) and 'spasmos' (spasm or convulsion), describing spasmic contractions limited to one half or side.
Hemifacial spasm, where half your face involuntarily twitches, is often caused by a blood vessel irritating a nerve—it's a reminder that the brain controls precisely which side of your body moves, side by side!
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