Half body weakness: "Hemi" refers to half. "Paresis" means weakness. Hemiparesis refers to a weakness over one side (half) of body. The most common cause is from a cerebral infarction (stroke) on one side of the brain. It usually affects the opposite side of the body relative to the side of stroke, although if the face is involved, that tends to be on the same side as the brain injury, (opposite) to body.
Answered 6/9/2017
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