sinus diagram head

August 03, 2026

General

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The sinuses are air-filled cavities located in the bones around the nose, eyes, and forehead. Their main role is to humidify and filter the air we breathe, lighten the skull, and enhance the resonance of the voice. Sinusitis is an inflammation, or swelling, of the tissue lining your sinuses. Sinuses are structures inside your face that are normally filled with air. Bacterial infections, viral infections and allergies can irritate them, causing them to get blocked and filled with fluid. In common usage, "sinus" usually refers to the paranasal sinuses, which are air cavities in the cranial bones, especially those near the nose and connecting to it. Most individuals have four paired cavities located in the cranial bone or skull. Sinus is Latin for "bay", "pocket", "curve", or "bosom". Sinus infections, or sinusitis, occur when a virus of bacteria enters the sinuses. Read on for a list of common symptoms and treatments. Sinusitis, also known as rhinosinusitis and commonly known as a sinus infection, is an inflammation of the mucous membranes that line the sinuses resulting in symptoms that may include production of thick nasal mucus, nasal congestion, facial congestion, facial pain, facial pressure, loss of smell, or fever. [6][2] For related background details, please refer to our report on hot tub disconnect wiring. Sinus pain and discomfort typically starts when your sinuses become irritated and inflamed, causing swelling that can narrow or close off the openings. This makes it hard for mucus to drain out of your sinus cavities. Mucus and air pressure build, causing a feeling of stuffiness and congestion. Most sinus infections resolve on their own within 10 days, but here are some things you can do to help get rid of sinusitis and improve your symptoms.