Finding Paragraph #3

As with many brain-related issues, there's really a lot we don't know about concussion itself, and exactly what it does to the brain.  But we all know that very soon afterwards there are many symptoms usually "headache, dizziness, nausea, confusion, irritability and lethargy are the main ones."  Sometimes there's amnesia, though it usually only lasts for a few hours. This answers my quesion what do they do to concussion patients?