A sinus is a hollow space in the body. There are many types of sinus, but sinusitis affects the paranasal sinuses, the spaces behind the face that lead to the nasal cavity.The paranasal sinuses have the same mucous membrane lining as the nose.They produce a slimy secretion called mucus. This keeps the nasal passages moist and traps dirt particles and germs.Sinusitis occurs when mucus builds up and the sinuses become inflamed.Doctors often refer to sinusitis as rhinosinusitus, because inflammation of the sinuses nearly always occurs with inflammation of the nose known as rhinitis.Sinusitis is a common inflammation of the paranasal sinuses, the cavities that produce the mucus necessary for the nasal passages to work effectively. It can be acute or chronic, and it can be caused by viruses, bacteria, fungi, allergies, or even an autoimmune reaction.Although uncomfortable and painful, sinusitis often goes away without medical intervention. However, if symptoms last more than 7 to 10 days, or if there is a fever or a bad headache, you should see your doctor.In 2015, it was noted that 12.1 percent of adults surveyed in the United States (U.S.) had been diagnosed with sinusitis in the previous 12 months.
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