Common Causes of Sinusitis

• Recent upper respiratory infections (such as a head cold)

• Allergies

• Asthma

• Crooked bone and cartilage between the nostrils (otherwise known as a deviated septum)

• Environmental factors, such as freezing cold air, poorly ventilated indoor air, cigarette smoke, and car exhaust

• Polyps

• Small objects inserted in the nose (common in children)

• Overuse of decongestant sprays