If you have yellow phlegm in your throat every morning, you need to find the source of the phlegm first. If there is only yellow sputum in the morning, it is considered to be due to rhinitis as well as sinus secretions that back up into the throat and cause related symptoms. The disease is usually seen in acute pharyngitis, acute nasopharyngitis or acute sinusitis, and can be diagnosed clearly by examining electronic rhinoscopy, electronic nasopharyngoscopy and sinus CT at the hospital. Acute rhinitis is caused by upper respiratory tract infection, which can lead to symptoms related to bilateral nasal congestion, yellow nasal discharge and coughing up yellow sputum in the morning, and treatment requires symptomatic anti-inflammatory therapy, which can be cured in about a week. Nasopharyngitis is caused by chronic inflammation that leads to mucosal congestion, edema and yellow secretions in the nasopharynx, and requires nebulizer inhalation treatment along with symptomatic anti-inflammatory treatment. Nebulizer treatment with budesonide, twice a day, can be cured in about a week. Sinusitis is caused by inflammation stimulating the sinus mucosa, causing mucosal congestion, edema, inflammatory exudation, especially maxillary sinusitis, because the maxillary sinus sinus opening upwards, only when the person is lying flat maxillary sinus secretions will be discharged, so it will lead to morning cough yellow sputum. The disease requires sinus puncture, irrigation, and symptomatic anti-inflammatory treatment for treatment, and surgery for chronic sinusitis.