Yellow snot, thick nose, may be caused by colds, chronic sinusitis, fungal sinusitis and so on. 1. Colds: the common cold combined with a bacterial infection, neutrophils phagocytosis to a certain extent will form pus, and snot mixed into yellow snot. It needs to be treated with antibiotics. 2. Chronic sinusitis: The main symptoms of chronic sinusitis are nasal congestion, thick nasal discharge and decreased sense of smell. You need to improve nasal endoscopy, sinus CT and other related examinations, and give medication or surgical treatment. 3. Fungal sinusitis: Fungal sinusitis can sometimes be combined with bacterial infections, with symptoms such as running nose and blood in sputum. Surgery is needed to cure it. The thick yellow nasal discharge from the nose may be caused by other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.