Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Post-concussion syndrome, also known as postconcussive syndrome or PCS, and historically called shell shock, is a set of symptoms that a person may experience for weeks, months, or occasionally years after a concussion-a mild form of traumatic brain injury (abbreviated TBI). PCS may also occur in moderate and severe cases of traumatic brain injury. Symptoms of PCS, which... Mehr