A closed head injury occurs when a blow to the head causes damage to the brain without breaking the skull. This type of injury can result from falls, sports accidents, or car crashes. Symptoms may include headaches, confusion, dizziness, and memory problems, depending on the severity of the injury. Diagnosis often involves imaging tests like CT scans or MRIs to assess brain function and detect any swelling or bleeding. Treatment varies based on the injury's severity and may include rest, medication, or rehabilitation. It's essential to monitor symptoms closely, as complications can arise even days after the initial injury.