CausesBy Mayo Clinic staff
Your brain has the consistency of gelatin. It's cushioned from everyday jolts and bumps by the cerebrospinal fluid that it floats in, inside your skull. A violent blow to your head and neck or upper body can cause your brain to slide back and forth forcefully against the inner wall of your skull. Sudden acceleration or deceleration of the head — resulting from events such as a car crash or being violently shaken (shaken baby syndrome) — also can cause brain injury.
These injuries affect brain function, usually for a brief period, resulting in signs and symptoms of concussion. A brain injury of this sort may even lead to bleeding in or around your brain causing symptoms, such as prolonged drowsiness and confusion, that may develop right away or even later. Such bleeding in your brain can be fatal. That's why anyone who experiences a brain injury needs to be monitored in the hours afterward and receive emergency care if symptoms worsen.
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