What symptom raises concern when assessing for head injury?

Repetitive vomiting is a key symptom that raises concern when assessing for a head injury because it can indicate increased intracranial pressure, which can be associated with severe brain injuries or concussion. When a person experiences repetitive vomiting after a head injury, it suggests that the brain is under distress, and this could potentially lead to more serious complications, such as brain swelling. This symptom often warrants immediate medical evaluation, as it can be an indicator of a significant underlying problem that requires urgent attention. In contrast, symptoms like fatigue and drowsiness may still be concerning but do not carry the same immediate severity as repetitive vomiting, while a peaceful demeanor and stable vital signs typically suggest less critical situations.