The causes of sinusitis may be categorized in the following ways:
Inflammatory and Infectious Causes - Sinusitis can be caused by bacterial, viral, and fungal infections, as well as allergies, polyps and reflux disease.
Anatomical Causes - The anatomy of the sinuses varies tremendously from person to person. In some individuals, anatomical differences may affect breathing and block nasal drainage. Common anatomical causes of sinusitis are a deviated septum and swelling of the turbinates.
Lifestyle Causes - Pregnancy, working with children, and smoking are some of the lifestyle choices that increase one's susceptibility to sinusitis.
Developmental Causes - Developmental disorders, such as cystic fibrosis, can lead to sinusitis.
Tumors - Sinus and nasal tumors can block critical drainage pathways and possibly lead to sinusitis.
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