This document discusses the causes, types, and symptoms of sinusitis. It explains that sinusitis is the inflammation of the sinus cavities caused by blockage that allows germs to grow. The main types are acute (lasting less than 4 weeks), subacute (4-8 weeks), chronic (more than 8 weeks), and recurrent (multiple attacks per year). Common causes of blockage include nasal polyps, allergies, deviated septums, and facial injuries. Symptoms of acute sinusitis include facial pain, nasal congestion, discharge, coughing, fever, bad breath, and fatigue. A diagnosis requires experiencing two or more symptoms.