Concussion symptoms may not show up immediately and may last for days, weeks, or even longer. These are the usual symptoms of a concussion based on severity. Physical Signs and Symptoms: Headache, Ringing in the ears, nausea, vomiting, fatigue or drowsiness and blurry vision. Behavioural Signs and Symptoms: Confusion or feeling as if in a fog, Amnesia surrounding the traumatic event, Dizziness or seeing stars, Temporary loss of consciousness, Slurred speech, Delayed response to questions, Dazed appearance and Forgetfulness, such as repeatedly asking the same question. Other symptoms that may or may not occur immediately after injury: concentration and memory complaints, irritability and other personality changes, sensitivity to light and noise, sleep disturbances, psychological adjustment problems and depression and disorders of taste and smell