Behavior changes are common after acquired brain injury (ABI) because the brain processes information differently after the injury. About 62% of people with ABI experience behavior changes.1 For some people with ABI, the changes in behavior have a major effect on their daily lives, while for others they may be relatively small. These changes can make daily tasks and social interactions difficult. People with ABI may be more sensitive to stress and fatigue, which can make the behaviors described in this article worse.