Yellow phlegm inside the nasal cavity refers to the yellow purulent discharge inside the nasal cavity, which mostly suggests that the patient has sinusitis. Generally for this disease, early is the main drug treatment, the routine can be used antibiotics, conditions can do the secretion bacterial culture, select sensitive antibiotics for treatment, can be short-term oral hormones, mucus promoter, nasal spray hormone and anti-histamine nasal spray and other symptomatic treatment. If the patient is accompanied by sneezing and other manifestations of allergic rhinitis, he can also take oral leukotriene receptor antagonists and other combined symptomatic treatment, and at the same time, he can do nasal irrigation treatment. Generally, most patients will have significant improvement in their symptoms after about one month of treatment. Usually, you should pay attention to try not to catch a cold and strengthen your immune system to avoid recurrent sinusitis. If the history of sinusitis is more than three months and medication is not effective, it is recommended to visit the otorhinolaryngology department of a regular hospital to improve sinus CT, nasal endoscopy and other examinations to assess whether surgery is needed.