HEAD INJURY - Refers to a group of head injuries ranging from minor to major. Examples include scalp contusion, scalp hematoma, concussion, brain contusion, skull fracture, epidural hematoma, intracerebral hemorrhage, subarachnoid hemorrhage, and subdural hematoma. Features shared by all head injuries (serious and non-serious) include: dizziness, nausea, vomiting, giddiness, sleepiness, and headache. More serious features include: protracted vomiting, lethargy, difficulty waking up, loss of consciousness, seizure, confusion, change in mentation, or coma.