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Answer: D - In order for the term concussion to be used, the injury must not be immediately life-threatening and there must be some change in mental status. The term concussion is not specific to sports injury, although it has been getting a lot of press lately due to the National Football League’s new regulations for the brain-injured athlete. A concussion is also not merely an injury to the brain caused by impact.. Typical signs of mental impairment may include: loss of consciousness, faulty short-term memory (for instance, asking the same questions repeatedly); drowsiness, nausea and vomiting, blurry or double vision, tinnitus, headache and more.