Which of the following describes a sign in a clinical setting?

In a clinical setting, a sign is an objective indication of a medical condition that can be observed or measured by a healthcare professional. Dizziness can be considered a sign if it leads to observable symptoms, such as a patient swaying or having difficulty maintaining balance when attempting to stand. This shows a physical change that can be assessed.

In contrast, the other options are classified as symptoms, which are subjective experiences reported by the patient. Fatigue, headache, and confusion are all sensations or feelings that a patient experiences internally and cannot be externally measured by a healthcare provider without subjective reporting. This distinction between signs, which can be observed, and symptoms, which are self-reported, is crucial for understanding patient assessments and documentation in clinical practice.