In
layperson's terms, a concussion results from trauma (e.g. usually but
not always a blow to the head, face or neck) which causes the brain - a
jellylike structure which is normally protected from collisions with
the skull by a tough, fluid-filled membrane - to collide with the
skull.
Regular post-concussion monitoring is essential in the first 24 to 48 hours after injury to check for signs of deteriorating mental status that may indicate a more serious injury, says Dr. Robert Cantu.