A head injury is any injury caused to the scalp, skull, or brain. The injury may be only a minor bump on the skull or a serious brain injury and can be either closed or open (penetrating). A closed head injury is the one caused by a hard blow to the head from striking an object, but the object did not break the skull.

Head injuries are one of the most common causes of disability and death in adults. The injury can be as mild as a bump, bruise (contusion), or cut on the head, or can be moderate to severe in nature due to a concussion, deep cut or open wound, fractured skull bone(s), or from internal bleeding and damage to the brain.

A head injury is a broad term that describes a vast array of injuries that occur to the scalp, skull, brain, and underlying tissue and blood vessels in the head. Head injuries are also commonly referred to as brain injury, or traumatic brain injury (TBI), depending on the extent of the head trauma.

Head injuries are rising dramatically--about 1.7 million people have a TBI each year. Millions of Americans are alive today who have had a head injury and now need help with the activities of daily living, costing the country more than $56 billion per year.