Depends..: Concussion is an injury of brain as a jolt there are 3 degrees of concussion depends on severity of injury - graded according to symptoms . In severe it may be temporary ( seconds) loss of consciousness. In general 24 h observation is recommended. If headache, nausea, dizziness, laps of consiousness or such - see emergency. Concentration problem, memory, sleep issues are common for while after.
Answered 10/21/2016
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