The middle ear and Eustachian tube have a mucous lining that traps and protects against harmful bacteria. But when you’re ...

Ever notice how, during a cold, it feels like only one nostril is completely blocked? It’s not just bad luck or an uneven ...

The COVID-19 virus spreads via mucus once inside an infected airway, allowing it to reach into the lower lungs, according to a Northwestern Medicine study published in Nature Communications.