Chronic sinusitis is a chronic inflammatory disease that occurs in the mucous membrane of the sinuses, mostly developed from repeated episodes of acute sinusitis. Chronic sinusitis is often associated with bacterial infections, but also with allergic reactions and abnormalities in the anatomy of the nasal cavity and sinuses, and the clinical symptoms are often characterized by nasal congestion, runny nose, olfactory dysfunction, headache and so on. Patients are first treated with medication, commonly used drugs include antibiotics (such as clarithromycin), and glucocorticoid drugs (such as budesonide, mometasone furoate). If the medication remains ineffective after three months, the need for surgery should be considered. If you suspect that you are suffering from sinusitis, you should go to the ENT department of the hospital in time to get a clear diagnosis.