Pus from the nostrils is a common clinical symptom nowadays, and medically there are two types of nostril pus: physiological nostril pus and pathological nostril pus. Physiological nostril discharge is caused by fire in the patient’s body. The pathological nostril pus is mostly caused by rhinitis and sinusitis, so patients need to go to a regular professional hospital for diagnosis and treatment. The diagnosis of nostril pus based on: 1, pressure pain are near the sinus wall, the nasal cavity can be seen in secondary lesions, such as turbinate hypertrophy or polyposis, septal mucosa thickening is nodular, secretions presented in the diseased sinus opening near the nasal tract, in the contraction of the sinus mouth nasal tract mucosa or for position drainage, secretions are easier to flow out, conducive to determine the signs of what sinus lesions. 2, sinus X-ray can show the lesion sinus cavity uniform cloudiness or air-fluid plane, this is the main diagnostic method. Sinus endoscopy can examine the sinus opening and sinus cavity lesion, which can make accurate diagnosis and decide the treatment mode. Ultrasonography is also useful for diagnosis, while sinus cavity fluoroscopy is now rarely used. 3.Sinus cavity irrigation, catheter probing into the frontal and pterygoid sinuses is now rarely used, while maxillary sinus puncture irrigation and injection of drugs is a common method for clinical diagnosis and treatment. 4, the complications caused by sinusitis should be diagnosed.