How Dry Air Affects Your Sinuses

The sinuses are air-filled cavities located in the forehead, cheeks, and behind the nose and eyes. These cavities are lined with a thin layer of mucus, which helps to trap dust, bacteria, and other foreign particles from entering the respiratory system. Ideally, the mucus should be moist and thin to help clear out these particles easily.

However, dry air — which is common in homes during the colder months or in air-conditioned environments — can cause the mucus to thicken and become sticky. This makes it more difficult for the sinuses to drain properly, leading to congestion, pain, and inflammation. When the sinuses become inflamed or blocked, it creates the perfect environment for infections, which can exacerbate symptoms.

If you've ever suffered from sinus congestion or pressure during the winter months or in an air-conditioned room, you’ve likely experienced the negative effects of dry air on your sinuses. In fact, the American College of Allergy, Asthma, and Immunology (ACAAI) recommends using a humidifier in environments with low humidity to help combat these issues.