The common causes of yellow nasal discharge in the morning include chronic rhinitis, sinusitis and nasal polyps. 1. Chronic rhinitis: mostly due to the exudation of inflammatory secretions caused by bacterial infection, which can be manifested as yellow nasal discharge, nasal congestion, headache and other symptoms. Bacteria are mostly hemolytic streptococcus, staphylococcus aureus and so on. 2. Sinusitis: an inflammatory disease that occurs in the mucosa of the sinuses, the inflammatory mediators will stimulate the glands of the nasal mucosa, leading to an increase in secretions and vascular exudation, resulting in yellowish pus runny nose in the morning, nose blockage and other manifestations. 3. Nasal polyps: related to immune disorders, pathogenic microbial infections, genetics and other factors. When the sinuses are blocked, the secretion is mucopurulent or purulent, resulting in the phenomenon of yellow pus nasal discharge in the morning. It is also accompanied by nasal congestion and snoring. If you get up in the morning with yellow nasal discharge, it is recommended that you go to a regular hospital in time to clarify the cause of the disease and target treatment.