The focal damage is most often at the point where the head hits an object or where an object, such as a bullet, enters the brain. In addition to focal damage, closed head injuries frequently cause diffuse brain injuries or damage to several other areas of the brain. The diffuse damage occurs when the impact of the injury causes the brain to move back and forth against the inside of the bony skull. The frontal and temporal lobes of the brain, the major speech and language areas, often receive the most damage in this way because they sit in pockets of the skull that allow more room for the brain to shift and sustain injury. Because these major speech and language areas often receive damage, communication difficulties frequently result from closed head injuries.
Head trauma can affect anyone at any age.
Males who are between 15 and 24 years of age have been more vulnerable because of their high-risk lifestyles. Young children and individuals over 75 years of age are also more susceptible to head injury. Falls around the home are the leading cause of injury for infants, toddlers, and elderly people. Violent shaking of an infant or toddler is another significant cause. The leading causes for adolescents and adults are automobile and motorcycle accidents, but injuries that occur during violent crimes are also a major source.