Sinusitis is inflammation of the sinuses. It occurs as a result of an infection from a virus, bacteria or fungus. Normally, mucus collecting in the sinuses drains into the nasal passages. When you have a cold or allergy attack, your sinuses become inflamed and are unable to drain. This can lead to congestion and infection, drainage accompanied by nasal obstruction, facial pain-pressure-fullness or headache. Most adults have eight sinus cavities: two Maxillary (cheek sinuses), two Frontal (forehead sinuses), two Ethmoid sinuses (between the eyes) and two Sphenoid sinuses (at the upper back part of the nose). Sinusitis can be acute or chronic. Acute sinusitis is normally treated with antibiotics and resolves. Sometimes sinusitis has to be diagnosed by a sinus x-ray or a CT scan. Chronic sinusitis is treated with long term antibiotics and steroids. In some cases, sinus surgery is required especially if polyps are noted in the nasal cavity. There are two types of sinus surgery: Functional Endoscopic Sinus Surgery and Balloon Sinuplasty.