Cough Drops and Tongue Irritation: Ingredients That Trigger Canker Sores

Why Some Cough Drops Cause Tongue Soreness

Certain ingredients can irritate oral mucosa, triggering aphthous ulcers (canker sores) in susceptible individuals.

Common Culprits

• Menthol, eucalyptus, peppermint, cinnamon oils: Intense flavorings → chemical irritation, drying.
• Artificial sweeteners (sorbitol, xylitol, mannitol): Osmotic effect draws fluid, causing mucosal irritation; laxative effect if swallowed in quantity.
• Tartaric acid: Acidic, can erode/irritate epithelium.
• Dyes, preservatives (benzoates, sulfites): Allergic/contact reactions.

Management

• Switch to plain honey/lozenges with minimal additives.
• Hydrate well.
• If sores persist >2 weeks, recur frequently, or are unusually large/painful → see dentist/physician.