Concussions can be difficult to diagnose. Although you may have a visible cut or bruise on your head, you can’t actually see a concussion. The signs and symptoms of a concussion are often subtle and may not show up immediately. Some symptoms can last for days, weeks, or even months. Common symptoms after a concussion are headache, loss of memory (amnesia), and confusion. Amnesia typically involves forgetting the event that caused the concussion. Physical symptoms and signs of a concussion may include: • Headache • Ringing in the ears • Nausea • Vomiting • Fatigue or drowsiness • Blurry vision Other symptoms of a concussion are: • Confusion or feeling “foggy” • Amnesia surrounding the traumatic event • Dizziness or “seeing stars”