Hi
The post-concussion syndrome or PCS lasts for weeks, months, or occasionally years after a
concussion or moderate to severe cases of traumatic brain injury. It is seen
in 38–80% of
mild head injuries. A diagnosis may be made when symptoms last for more than three months after the injury, or it may be made starting within a week or ten days of trauma. In late, persistent, or prolonged PCS, symptoms last for over six months, or by other standards, three.