A medical condition characterized by the inability to stand upright, usually due to neurological problems rather than muscle weakness.
From Greek 'a-' (without) plus 'stasis' (standing, position). The term entered medical vocabulary in the 19th century as doctors classified nervous disorders more precisely.
Astasia is different from paralysis because the muscles work fine—the problem is in the nervous system's instructions, like a broken communication cable between brain and body.
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