Which of the following is considered a life-threatening injury?

A head injury is considered a life-threatening injury because it can result in serious complications, such as brain swelling, bleeding within the skull, or a concussion, all of which can significantly affect neurological function and can lead to death if not managed properly. Depending on the severity of the injury, a head injury may compromise vital functions, including consciousness, breathing, and heart rate, making prompt assessment and treatment crucial.

In contrast, a fractured arm, while potentially painful and requiring medical care, typically does not pose an immediate threat to life if other body systems are functioning normally. Similarly, a minor cut generally does not lead to life-threatening consequences unless it becomes infected or is part of a more complex injury, while a sprained ankle, though potentially debilitating, does not typically endanger one’s life. Therefore, among the options provided, a head injury stands out as the most critical due to its potential for serious and immediate health risks.