The diagnosis of sinusitis is mostly made by a detailed clinical history and careful physical examination, but since most of the symptoms are not specific, we can also assist in the diagnosis by other methods, including: 1. cytological examination of nasal secretions: sinusitis is mostly neutrophilic balls, and sometimes even intracellular pathogens can be seen, if the secretions are more than ten percent of the eosinophilic balls, then we should pay attention to the possibility of allergic rhinitis, especially in pediatric patients. Especially in pediatric patients. However, the possibility of allergic rhinitis cannot be ruled out even if there are no eosinophilic globules in the examination. 2.Nasal endoscopy: The patient’s cooperation is required, and pediatric patients sometimes do not cooperate well during the examination. 3.Radiography: In patients with acute or severe acute sinusitis, X-rays can be taken because of the invasion of the maxillary sinus. However, patients with chronic sinusitis invade the septal sinus mainly, and CT examination can be considered at this time. 4, transillumination method: you can see the presence of sinusitis, but because many people do not always happen to be very symmetrical bilateral sinus, so the sensitivity and specificity are poor. In conclusion, when we diagnose a patient with allergic rhinitis and the response to treatment is not as good as expected, we must be aware of the possibility of combined sinusitis. According to many studies, the rate of allergic rhinitis is much higher in patients with sinusitis than in the general population. Therefore, when you have allergic rhinitis or sinusitis, you should not ignore the close relationship between the two in order to make the treatment more successful.