Fatigue

If there is  "most common" symptom immediately after brain injury, it may well be fatigue.

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It happens along a continuum ranging from "Wow I am so tired?" to complete and total exhaustion getting in the way of daily functions. "Knackered"

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Fatigue makes sense: the brain just got bumped, concussed or otherwise assaulted and like every other body part deploys emergency response mechanisms.

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Depending upon severity of brain change, fatigue may improve relatively quickly (weeks to months) or it may be a persistent feature of a "new normal."

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