Sinuses are bony, hollow, air-filled cavities inside the face and skull. They are located in the low-center of the forehead, behind the eyes and in bones behind the nose. Cedars-Sinai Medical Center says the sinuses lighten the skull and produce a mucus that moisturizes the inside of the nose. Unfortunately, when colds or the flu strike, sinuses may become one of the first spots affected by these illnesses.
When the sinuses are working properly, mucus will drain into the nasal passages or out the back of the throat. Most of this drainage goes unnoticed. However, the American Sinus Institute says that factors such as allergies, illness, weather changes, dehydration and dry air can make the sinus mucus thicker and drainage more difficult. This is when problems like infection, stuffiness or throat irritation may occur.
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