Plural of coma: periods of deep unconsciousness from which a person is very difficult to awaken, usually caused by injury or illness.
From Greek 'koma' meaning 'deep sleep.' The word entered medical terminology via Latin and has been used in English since the 1600s to describe unconscious states.
Comas are mysterious because doctors still can't fully explain why some people wake up after weeks while others don't—brain injuries affect everyone differently, which is why recovery times are so unpredictable.
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