Excessive sweating affecting only one half or one side of the body.
From 'hemi-' (half) + Greek 'hidrosis' (sweating), a medical term that emerged in the 1800s to describe asymmetrical sweating conditions.
Hemihydrosis can signal a nerve problem or spinal issue on one side of the body—it's one of those quirky medical conditions that shows how our nervous system controls even something as everyday as sweating, and when it goes wrong, it's dramatically one-sided.
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