Chronic sinusitis is sinusitis that lasts for more than 12 weeks. how is sinusitis 2. sinusitis diagnosed? symptoms of sinusitis mimic a cold in the early stages and penaksiran can be difficult. however, sinusitis tends to persist long after cold symptoms have resolved and symptoms can last for three weeks or more. Jan 29, 2020 · if you've ever had a cold that just wouldn't go away, chances are it was sinusitis — an inflammation of the paranasal sinuses, the cavities within the bones that surround the nose. the sinuses are lined with a thin membrane that produces mucus, which is normally swept along by hair cells and drains through small openings into the nasal cavity. Sinusitis is an inflammatory condition affecting the nose and paranasal sinuses. it is one of the most common primary care presentations in australia, and 1. 4 in every 100 general practice encounters were for acute or chronic sinusitis. 1 in 2011 and 2012, an estimated 1. 9 million australians had chronic rhinos...