Yellow nasal mucus, mostly caused by bacterial infection, commonly associated with sinusitis and other diseases, need to do nasal endoscopy, sinus CT and other tests, a clear diagnosis, anti-infection or surgical treatment. General nasal yellow snot first consider sinusitis, generally if it is after a cold, or chronic rhinitis bleeding yellow snot increase, combined with nasal congestion and headache need to do sinus CT examination in time to see the mucous membrane of the nasal cavity, but also according to the endonasal endoscopy to observe the nasal cavity secretion traits and sources. Acute sinusitis, often use glucocorticoids such as tretinoin nasal spray nasal spray, combined with mucosal drainage agents such as eucalyptus-pinocampus enteric capsules, oral anti-inflammatory drugs such as clarithromycin dispersible tablets. Chronic sinusitis usually lasts more than 3 months, if the symptoms are not relieved after 3 months of continuous standardized conservative treatment, it is necessary to review the sinus CT, and the specialist will assess whether surgical treatment is needed. Yellow snot, there may be nasal foreign body secondary bacterial infection, may also be nasal cavity, sinus tumors, etc., it is recommended to consult a doctor in a timely manner, a clear diagnosis, and comply with the doctor’s instructions for treatment.