According to the Mayo Clinic, the sinuses are air-filled, hollow spaces or cavities within the facial bones surrounding the nose.
When the linings of the sinuses become infected, usually due to viruses or bacteria, they may swell, causing an obstruction and interfering with the normal drainage of mucus. Sinusitis can cause considerable discomfort and can lead to more serious infections if left untreated.
Although sinusitis can become a chronic condition, most cases are short-lived (acute) and treatment lasts about two weeks.
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