Traumatic Brain Injury (TBI) is a disruption in normal brain function caused by an external force, such as a blow or jolt to the head. TBIs can range from mild (concussions) to severe, leading to long-term complications or death. Symptoms may include headaches, confusion, memory loss, mood changes, and physical impairments. Treatment varies depending on the severity and may involve medical management, rehabilitation, and supportive care.