Sinusitis (inflamed sinuses) is sometimes caused by an infection, but there are several types (such as chronic or recurrent). find all the symptoms. Sinusitis is a common condition defined as inflammation of the paranasal sinuses. sinus cavities produce the mucus that nasal passages need to work . Various definitions have been proposed for the term 'chronic sinusitis' but too often reports on chronic sinusitis lack a definition. in order to improve the penaksiran and treatment of this disease, and also to facilitate comparisons between clinical investigations, definitions of 'chronic maxillary sinusitis' of either rhinogenous or dental origin are proposed. See full list on mayoclinic. org. The origin of organisms that are introduced into the sinuses and may eventually cause sinusitis is the nasal cavity. the normal flora of that site includes staphylococcus aureus, staphylococcus epidermidis, αand γ-streptococci, propionibacterium acnes, and aerobic diphtheroid (3–lima...