Sinusitis is not the same as rhinitis. Sinusitis refers to an infectious condition such as acute and chronic inflammation of the sinus region, including maxillary sinusitis, septal sinusitis, frontal sinusitis, and pterygoid sinusitis, etc. Inflammatory infections of these sinuses may exist alone, or there may be multiple groups of sinus co-infections. Rhinitis refers to inflammatory infectious as well as allergic disease conditions of the nasal mucosa, commonly including acute rhinitis, chronic rhinitis, allergic rhinitis, atrophic rhinitis, etc. In terms of symptoms, the two may have some similarities, both may cause nasal congestion, loss of smell, headache and other symptoms, but patients with sinusitis mainly have yellow or yellow-green purulent nasal symptoms, while patients with rhinitis mostly have clear watery, mucus-like nasal discharge, which can be differentiated and diagnosed by further nasal endoscopy and nasal imaging.