Sinusitis refers to the inflammation or swelling of the sinuses tissues. Under normal circumstances air fills the sinuses, but when these get filled with liquid, germs such as bacteria, fungus and virus start growing there, causing infection. Sinusitis is a pretty common condition that affects millions across the globe every year.

Sinusitis can set in due to common cold, a deviated septum, or allergic rhinitis (swelling in the nose lining).
Different types