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Located behind the bones of the face are hollow spaces filled with air. These hollow spaces are the sinuses and they act as a passage between the nasal cavity plus the nostrils. So what is sinusitis? Sinusitis is an inflammation or swelling of the sinuses. Widespread symptoms include pain or pressure within the face, nasal obstruction or blockage, along with a thick post-nasal drip. Those suffering from sinusitis could also experience headaches, a fever, or feel fatigued.
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