Final answer:
A traumatic brain injury occurs when an external force causes brain dysfunction. It can result in various symptoms and may require treatment and therapies to help the person recover or cope with their disabilities.
Step-by-step explanation:
A traumatic brain injury occurs when an external mechanical force causes brain dysfunction. This can result from a violent blow or jolt to the head or body, or an object penetrating the skull. Symptoms of a brain injury can include trouble talking, controlling body movements, personality changes, and problems with memory and mental abilities. Treatment for a serious brain injury may include medicines, counseling, and other therapies to help the person recover or learn to cope with their disabilities.