Head injury is common and accounts for a significant proportion of patient attendances at emergency departments and minor injury units. While most injuries will not be serious in nature, some will be severe. Therefore assessment, investigation and early management of head injury are essential to reduce the potential risk of disability or even death. This article focuses on emergency care of children and adults with head injuries. Advice about the signs and symptoms of severe head injury, the importance of computed tomography and after care following head injury are outlined.