The signs and symptoms of a concussion can be subtle and may not show up immediately. Symptoms can last for days, weeks or even longer. Common symptoms after a concussive traumatic brain injury are headache, loss of memory (amnesia) and confusion. The amnesia usually involves forgetting the event that caused the concussion. Physical signs and symptoms of a concussion may include:  Headache Ringing in the ears Nausea Vomiting Fatigue or drowsiness Blurry vision  Other signs and symptoms of a concussion include:  Confusion or feeling as if in a fog Amnesia surrounding the traumatic event Dizziness or "seeing stars"  A witness may observe these signs and symptoms in the concussed person:  Temporary loss of consciousness (though this doesn't always occur) Slurred speech Delayed response to questions Dazed appearance Forgetfulness, such as repeatedly asking the same question  You may have some symptoms of concussions immediately, and some can occur for days after the injury, such as:  Concentration and memory complaints Irritability and other personality changes Sensitivity to light and noise Sleep disturbances Psychological adjustment problems and depression Disorders of taste and smell  Symptoms in children Head trauma is very common in young children. But concussions can be difficult to recognize in infants and toddlers because they can't describe how they feel. Concussion clues may include:  Dazed appearance Listlessness and tiring easily Irritability and crankiness Loss of balance and unsteady walking Excessive crying Change in eating or sleeping patterns Lack of interest in favorite toys Vomiting Seizures 
signs symptoms concussion can subtle may show immediately  symptoms can last days  weeks longer  common symptoms concussive traumatic brain injury headache  loss memory (amnesia) confusion  amnesia involves forgetting event caused concussion  physical signs symptoms concussion may include:  headache ringing ears nausea vomiting fatigue drowsiness blurry vision  signs symptoms concussion include:  confusion feeling fog amnesia surrounding traumatic event dizziness "seeing stars"  witness may observe signs symptoms concussed person:  temporary loss consciousness (though doesn't occur) slurred speech delayed response questions dazed appearance forgetfulness  repeatedly asking question  may symptoms concussions immediately  can occur days injury  as:  concentration memory complaints irritability personality changes sensitivity light noise sleep disturbances psychological adjustment problems depression disorders taste smell  symptoms children head trauma common young children  concussions can difficult recognize infants toddlers can't feel  concussion clues may include:  dazed appearance listlessness tiring easily irritability crankiness loss balance unsteady walking excessive crying change eating sleeping patterns lack interest favorite toys vomiting seizures 
concussion