Pain affecting one side of the body or one half of a specific body part.
From Greek 'hemi-' (half) combined with 'algos' (pain). Used in medicine since the 1800s to describe pain conditions that affect only half the body.
Hemialgia is a clue that doctors use to pinpoint where the problem is—pain on just one side often means the issue is in the brain or spinal cord on that side, not in the painful area itself!
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