Getting up in the morning with yellow sputum in the nasal cavity may be caused by upper respiratory tract infection, acute sinusitis, chronic sinusitis and other diseases. 1. Upper respiratory tract infection: If the upper respiratory tract is infected with purulent bacteria, it can cause yellow secretion in the nasal cavity. As a result of infection, the nasal mucosa appears obvious inflammatory reaction, manifested as mucosal congestion, edema, a large number of yellow purulent secretion exudation. 2. Acute sinusitis: inflammatory factors in the sinus cavity will produce yellow purulent secretions. During sleep, inflammatory secretions are easily accumulated in the nasal cavity and nasopharynx. When you get up in the morning, the yellow secretion may be concentrated and discharged. 3. Chronic sinusitis: acute sinusitis repeated episodes of treatment is not complete, easy to induce chronic sinusitis. In addition, nasal septum deviation, hooked hypertrophy, the middle turbinate reverse curvature, etc., can lead to sinus mouth is not smooth, secondary virus, bacterial infection, resulting in chronic sinusitis, yellow pus nasal discharge, nasal congestion and other symptoms. It is recommended that patients seek timely medical examination of the disease, and actively cooperate with physicians to treat the disease, to avoid aggravation of the condition.