Why Do Sinus Infections Cause Bad Breath?

Sinus infections can cause bad breath because bacteria feed on the mucus produced by inflamed sinuses. Bad breath derived from the sinuses or other parts of the upper respiratory system is called ozostomia.
  1. Postnasal Drip

    • When your nose becomes stuffy, excess mucus starts to drip down the back of the throat. This postnasal drip can stick to the throat and lead to the uncomfortable feeling of always needing to swallow.

    Bacteria

    • In the throat, anaerobic bacteria in the mouth break down the protein-rich mucus into sulfuric compounds, which smell and taste bad.

    Sinusitis

    • Sinusitis, which can be caused by bacteria, viruses or fungi, results in mucus that is infected and foul smelling even before it becomes postnasal drip, compounding the problem.

    Treatment

    • Bacterial sinus infections may be treated with antibiotics. Decongestants are useful for decreasing swelling and mucus production in the sinuses.

    Warnings

    • Breath that smells like fruit, ammonia or feces could be a sign of more serious conditions. Talk to your doctor if your bad breath does not go away when you treat your sinus infection.

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