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 …

Jan 28, 2025 · A sinus infection occurs when your nasal cavities become swollen, infected, or inflamed. Learn about the symptoms and how to treat them.

Jul 16, 2025 · Sinus infections, or sinusitis, occur when a virus of bacteria enters the sinuses. Read on for a list of common symptoms and treatments.

Sep 9, 2025 · 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 …

Apr 17, 2024 · When you have a sinus infection, one or more of your sinuses becomes inflamed. Fluid builds up, which can cause congestion and runny nose.

Nov 22, 2025 · Sinusitis, also known as a sinus infection, can cause symptoms such as facial pain, congestion, and headache.

Feb 9, 2026 · Sinus infections, also known as acute sinusitis, occur when the air‑filled spaces around your nose become inflamed and swollen. They’re most often caused by common cold viruses and …

Sinusitis is one of the most common medical conditions. Sinusitis may occur in any of the four groups of sinuses: maxillary, ethmoid, frontal, or sphenoid. Sinusitis nearly always occurs in conjunction …

Aug 13, 2024 · Sinusitis refers to inflammation of one or more of the sinuses, most often caused by infection. Sinusitis can leave you with nasal congestion, facial pain, and headaches. You may also …

Most sinus infections are caused by viruses or bacteria. This can happen when the common cold, the flu, COVID-19, allergies, or another illness causes your sinus tissue to swell, leading to a buildup of …