There are several types of sinusitis classified based on duration of episodes and symptoms between episodes. Acute bacterial sinusitis lasts less than 30 days with complete resolution of symptoms between. Sub-acute lasts 30-90 days with complete resolution, while recurrent acute is episodes under 30 days recurring every 10 days. Chronic sinusitis lasts over 90 days with persistent residual respiratory symptoms between episodes.

11. TYPE OF SINUSITIS DURATION OF EACH EPISODE SYMPTOMS IN BETWEEN EPISODES ACUTE BACTERIAL SINUSITIS < 30 DAYS COMPLETE RESOLUTION SUB-ACUTE BACTERIAL SINUSITIS 30- 90 DAYS COMPLETE RESOLUTION RECURRENT ACUTE BACTERIAL SINUSITIS EACH EPISODE <30 DAYS @ INTERVAL OF 10 DAYS COMPLETE RESOLUTION CHRONIC SINUSITIS > 90 DAYS PERSISTENT RESIDUAL RESPIRATORY SYMPTOMS (Cough, Rhinorrhea, Nasal Blockage) ACUTE SINUSITIS SUPERIMPOSED TO CHRONIC SINUSITIS ___ NEW RESPIRATORY SYMPTOMS IN PATIENT WITH RESIDUAL RESPIRATORY SYMPTOMS