This document discusses head injuries, including classification, signs and symptoms, diagnostic tests, management, and rehabilitation. Head injuries can be scalp injuries, skull fractures, or brain injuries including concussions and contusions. Risk factors include alcohol use, young age, and certain activities. Signs may include changes in behavior, vomiting, or seizures. Diagnostic tests include CT scans, MRI, and blood tests. Initial management focuses on airway, breathing, circulation, and external examination. Rehabilitation therapies aid recovery and may include cognitive, physical, speech, and occupational therapies.