The symptoms of sinusitis can vary widely, primarily related to the extent of the inflammation and the patient's own immune resistance. It is possible to have no obvious clinical manifestations, mainly in those with good resistance and very mild inflammation. The patient may not experience any significant symptoms, and sinusitis might only be discovered through a sinus CT or a head CT. If the inflammatory response is more noticeable, symptoms may include nasal congestion, purulent nasal discharge, headache, dizziness, and a reduction or loss of smell. Some patients might also experience numbness and a feeling of pressure in the face. Diagnosis typically involves a sinus CT or nasopharyngeal examination, as well as direct visual observation of the nasal cavity and an overall assessment of the patient's condition, followed by targeted treatment.