Abstract
The post-concussional syndrome (PCS) is a relatively common and potentially devastating condition. It may follow what seem to be quite trivial closed head injuries, as well as more obviously severe cases. Despite a considerable volume of clinical and research publications in the past 25 years, which generally point towards an organic basis to the condition, the PCS seems to remain largely overlooked or under-diagnosed in this country. This paper presents a summary of the history of medical research and controversy relating to concussion and the PCS. Evidence in support of the organic aetiology of the PCS is summarised.