TIL: Guillain-Barré syndrome is a peripheral neuropathy caused by an autoimmune reaction that targets the myelin around peripheral nerves. This causes progressive numbness in the extremities that starts at the hands and feet, before advancing toward the torso where it quickly becomes life-threatening. In this way, progressive arm or leg weakness can be an omen of sudden respiratory failure. So, there's a nice fact for all you hypochondriacs out there!
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