Post-concussion syndrome
Post-concussion syndrome, also known as postconcussive syndrome or PCS, is a set of symptoms that may continue for weeks, months, or a year or more after a concussion – a mild form of traumatic brain injury (TBI). The rates of PCS vary, but most studies report that about 15% of individuals with a history of a single concussion develop persistent symptoms associated with the injury. A diagnosis may be made when symptoms resulting from concussion last for more than three months after the injury. Loss of consciousness is not required for a diagnosis of concussion or post-concussion syndrome.
Post-traumatic seizure
PTS is associated with a generally good prognosis. It is unknown exactly how long after a TBI a person is at higher risk for seizures than the rest of the population, but estimates have suggested lengths of 10 to over 15 years. For most people with TBI, seizures do not occur after three months, and only 20–25% of people who suffer TBI have PTS more than two years after the injury. However, moderate and severe TBI still confer a high risk for PTS for up to five years after the injury.