Laboratory tests must be based on the history and physical examination to summarize and analyze the objective materials, from which several diagnostic possibilities are proposed, and then further consideration is given to those laboratory tests to confirm the diagnosis. For example, rhinoscopy and CT examination of otorhinolaryngology. Basic examinations: 1. Anterior rhinoscopy. 2.X-ray nasal angiogram to clarify the presence of concurrent sinus infection. Further examination: 1.Smear of nasal secretion to detect pathogenic bacteria. 2.Bacterial culture of nasal secretion + drug sensitivity. 3.Virus examination if necessary, special culture, isolation and identification are required.