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Pathology · single question

Xerostomia can result from all of the following EXCEPT:

  1. Vitamin C deficiency
  2. Sjögren syndrome
  3. Anticholinergic/antihistamine medications
  4. Head-and-neck radiation
Show answer and explanation

Correct answer: A. Vitamin C deficiency

  • A. Correct. Xerostomia is rarely caused by a vitamin deficiency; vitamin C deficiency causes scurvy (gingival bleeding), not dry mouth.
  • B. Sjögren syndrome destroys salivary/lacrimal glands, causing dry mouth/eyes.
  • C. Anticholinergics and antihistamines (e.g., diphenhydramine) reduce salivary secretion.
  • D. Radiation damages salivary glands, causing lasting xerostomia.

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