Abnormally increased muscle tension or rigidity affecting only one half or one side of the body.
From 'hemi-' (half) + 'hyper-' (excessive) + Greek 'tonos' (tension), a neurological term describing unilateral muscle stiffness or tone problems.
Hemihypertonia often appears after a stroke, where one side of the body becomes stiff and resistant to movement because the brain damage has knocked out the muscles' ability to relax—it's like one side of your body got stuck in a tension knot.
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