<unk> , also known as<unk> concussive<unk>  or<unk> , is a set of symptoms that a person may experience for weeks, months, or even years after a<unk> , a mild form of traumatic brain injury (TBI).   As many as 50% of patients who have experienced<unk>  have<unk> ,  but the prevalence is not well known and varies based on the definition of the<unk>  and the length of time after which it is diagnosed.<unk>  is the most common entity to be diagnosed after TBI. A diagnosis of<unk>  may be made in patients who have symptoms resulting from<unk>  for more than three months after the injury, or it may be made in patients with symptoms starting within a week of trauma.  In late, persistent, or prolonged<unk>  (PPCS), symptoms last for over six months, or by other standards, three. Most cases of<unk>  go away on their own in time.<unk>  may also occur in sufferers of moderate and severe TBI.
It is not known what causes<unk>  symptoms to occur and persist or why some patients who suffer a mild traumatic brain injury (mTBI) develop<unk>  while others do not.  It is commonly believed that physiological and psychological factors before, during, and after the injury all take part in the development of<unk> .
The name "post-concussive<unk> " was first coined by S. H. Auerbach. The nature of the<unk>  and the diagnosis itself have long been the subject of intense debate.
Post-concussion syndrome
Post stroke depression
Organic brain syndrome
Stroke recovery
Diencephalic syndrome
Excited delirium
Conversion disorder
Chiasmal Syndrome