health

Concussion is defined as a closed-head injury (that is, one that does not
involve a skull fracture) usually caused by blunt-force impact. Concussion
was traditionally used by doctors to refer to temporary loss of consciousness
from a head injury, but in everyday language, the term
usually means any minor injury to the head or brain. Concussions
generally are not life-threatening but may involve long-term as well as
short-term health problems.