A sinus infection, commonly referred to as sinusitis, can have a variety of other names. These synonyms include sinus inflammation, sinus congestion, sinusitis infection, and sinus blockage. A sinus infection occurs when the tissue lining the sinuses becomes swollen and inflamed, causing a buildup of mucus and fluid. Other synonyms for a sinus infection may include sinus pressure, sinus headache, and sinus pain. These symptoms can often be relieved through over-the-counter decongestants and pain relievers, but if symptoms persist, it may be necessary to seek medical attention and receive antibiotics. It is important to treat a sinus infection promptly to prevent further complications.