Epidural hematoma is when bleeding occurs between the tough outer membrane covering the brain (dura mater) and the skull.[4] Often there is loss of consciousness following a head injury, a brief regaining of consciousness, and then loss of consciousness again[1]Other symptoms may include headache, confusion, vomiting, and an inability to move parts of the body.[2]Complications may include seizures

 More Info :https://en.wikipedia.org/wiki/Epidural_hematoma
[1]Pooler, Charlotte (2009). Porth Pathophysiology: Concepts of Altered Health States. Lippincott Williams & Wilkins. p. 1256. ISBN 9781605477817.

 [2]Ferri, Fred F. (2016). Ferri's Clinical Advisor 2017 E-Book: 5 Books in 1. Elsevier Health Sciences. p. 441. ISBN 9780323448383.