After getting a concussion, almost all people show symptoms. These symptoms can be physical, emotional/behavioral, or thinking. Some physical symptoms are Headaches, Fatigue, seeming tired, trouble staying awake, Trouble sleeping, Lack of energy, slow-moving, Blurry or double vision, Sensitivity to noise or light, Dizziness, feeling lightheaded, or Nausea. Emotional/behavioral and thinking symptoms could be Not remembering how the concussion happened, Becoming easily confused, Slowness in thinking, seeming “foggy” or “zoned out”, Difficulty paying attention, Forgetfulness, memory problems, and More difficulty at school than normal.

http://www.stlouischildrens.org/articles/wellness/concussion-fact-sheet