Your risk of increases if you have recently had a cold, another or , or an . Also, chronic nasal allergies () can lead to sinusitis.
Sometimes a , broken nose, or growths such as nasal can make you more susceptible to sinus infections. Problems with nasal structure can prevent the proper flow of from the sinuses into the nose.
Other factors that increase your risk for getting sinus infections include smoking, air pollution, overuse of decongestant sprays, cold weather, rapid air pressure changes (such as from flying or scuba diving), and swimming in contaminated water. Also, using (CPAP) to treat may increase the risk of sinusitis.