Which statement correctly differentiates xerostomia from hyposalivation?

• A. Xerostomia is the subjective feeling of dryness; hyposalivation is reduced saliva production
• B. Xerostomia is reduced saliva production; hyposalivation is the feeling of dryness
• C. Both terms refer to the same condition
• D. Neither relates to saliva output

Answer: (A)

Xerostomia describes the patient’s subjective feeling of oral dryness, while hyposalivation is an objectively measured reduction in saliva production. A person can feel dry mouth even if saliva flow is normal, and conversely, reduced saliva can occur without a strong sensation of dryness. This distinction is what makes the correct statement: the subjective experience of dryness is xerostomia, whereas the actual decrease in saliva production is hyposalivation. The other ideas mix up these definitions or claim there’s no relation to saliva output. In practice, clinicians assess hyposalivation by measuring saliva flow (sialometry) and compare it with any reported symptoms of xerostomia to guide management.