Checking sinusitis mainly has the following aspects: first, from the symptoms of the patient mostly has a non-ventilation of the nose, repeated flow of yellow pus nasal discharge, decreased sense of smell, accompanied by the head or facial stuffiness, pain and other discomfort, if there are the above symptoms suggest that there may be sinusitis. Second, physical examination, clinical application of nasal endoscopy can be seen when the nasal mucosa congestion, swelling and hooked hypertrophy, purulent discharge or polypoid changes in the middle nasal tract, the patient’s nasal cavity narrowing and other changes. Third, clinically, by doing sinus CT or MRI, it is possible to see inflammatory changes within the sinus mucosa, soft tissue shadows in the sinus, blockage of the sinus complex in the nasal tract, soft tissue shadows in the middle nasal tract, olfactory fissure, and other related conditions, suggesting possible sinusitis changes. Fourthly, sinusitis, especially maxillary sinusitis, can be clinically done by maxillary sinus puncture, and if purulent discharge can be extracted, it also suggests possible sinusitis. All in all, sinusitis is clinically determined mainly through history, physical examination, and ancillary tests.