Head injury management begins with a primary trauma survey per ATLS guidelines, emphasizing the prevention of secondary brain injury by maintaining oxygenation, perfusion, and glucose control. Classification of mild head injury or concussion includes a range of symptoms and risk levels, from brief confusion to loss of consciousness. CT imaging is guided by stratified risk: immediate for severe signs (e.g., GCS 65, anticoagulant use), and during observation for deteriorating patients. Hospital admission and monitoring depend on neurological status and imaging. Discharge requires stability, supervision, and access to follow-up cares.