Abnormal or impaired sensation affecting only one side of the body, such as numbness or tingling on one half.
From Greek 'hemi-' (half) + 'dys-' (bad, difficult) + 'aesthesia' (sensation, feeling). The term describes diminished or distorted sensation limited to one side of the body.
This condition reveals how your sensory nervous system is basically split down the middle—each side of your brain processes touch, temperature, and pain from the opposite side of your body, so specific injuries create these perfectly one-sided sensory deficits.
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