Sinusitis is the inflammation and swelling of the tissue lining your sinuses. The sinuses are structures inside your face called sinuses that are usually air-filled and sometimes allergies, viral infections, and bacterial infections can aggravate them to the point where they become clogged, and fluid filled. In addition to other symptoms including a stuffy nose and facial pain and pressure, sinusitis can also induce nasal congestion. This article explains why your sinus symptoms may be ...