Concussion

A concussion, also known as a mild traumatic brain injury, is a head injury that temporarily affects brain functioning. Symptoms may include headache, dizziness, difficulty with thinking and concentration, sleep disturbances, a brief period of memory loss, brief loss of consciousness, problems with balance, nausea, blurred vision and mood changes. Concussion should be suspected if a person hits their head and experiences any of these symptoms. Signs and symptoms usually occur within minutes to hours of the injury, typically within 72 hours, though symptoms may be delayed by one to two days after the accident. It is not unusual for symptoms to last two weeks in adults and four weeks in children, and symptoms may make it difficult to return to work, school, sports or a prior level of functioning, with disability usually lasting days to weeks.