Which of the following is a sign of a possible serious head injury?

Bleeding or clear fluid leaking from the nose or ears can indicate a serious head injury, such as a skull fracture. This leakage is particularly concerning when the fluid is cerebrospinal fluid (CSF), which can occur if the protective coverings of the brain are compromised. This condition can lead to complications like brain infection or further brain damage, making it critical to recognize and respond appropriately.

While other symptoms like dizziness, acute headaches, or bleeding from the mouth can sometimes accompany head injuries, they are not as specifically indicative of severe conditions as clear fluid from the nose or ears. Recognizing the signs that suggest the potential breach of the brain's protective barriers is essential in assessing the seriousness of head injuries and determining the urgency of medical intervention.