Are concussions always caused by a direct blow to the head?

While concussions are often associated with a direct blow to the head, they can also be caused by any force that results in a rapid movement of the head. This can include a whiplash-type injury or a fall where the head doesn’t necessarily hit anything but moves rapidly enough to cause the brain to bounce or twist inside the skull, leading to damage. The key aspect is the force and speed of movement, which can cause the brain to collide with the inner walls of the skull.

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