A sinus infection, also known as sinusitis, is an inflammation and swelling of your sinuses. The sinuses are a group of air-filled spaces in the facial bones. When a person has a sinus infection, air and mucus become trapped in the swollen sinuses, promoting the growth of germs and other bacteria, eventually leading to an infection.
Sometimes it is difficult to tell if you have a sinus infection, a cold or other upper respiratory infection, or are suffering from allergies. Take our quiz to get a better idea if your symptoms might be due to sinusitis.