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