Which of the following indicates a serious head injury?

A serious head injury can manifest through significant symptoms that suggest the brain might be affected. Nausea and vomiting are common indicators of increased intracranial pressure or a concussion, which may arise from a more severe injury. Confusion or disorientation points to possible brain trauma that affects cognitive function and the individual’s awareness of their surroundings.

When both nausea and vomiting, alongside confusion or disorientation, are present, they often signal a more critical condition requiring immediate medical evaluation. Therefore, the combination of these symptoms, as indicated in the correct choice, highlights the seriousness of a head injury and the urgency of seeking further medical assistance.