Throat with mucus, coughing out white sputum, may be caused by chronic pharyngolaryngitis, recurrent pharyngolaryngitis, rhinitis, acid reflux disease, etc. can cause this symptom. 1. Pharyngitis: the pharyngeal mucosa is stimulated by microbial infections and physical and chemical factors that cause increased mucus secretion, which adheres to the posterior wall of the pharynx to form white sputum. 2. Rhinitis: common as allergic rhinitis, chronic rhinitis, etc., due to edema of the nasal mucosa, due to inflammatory reaction leading to increased secretion, flow from the posterior nostril to the throat, stimulation of the mucous membrane of the pharynx leading to coughing, white sputum. 3. Acid Reflux Disease (ARD): Insufficient gastric motility, obesity and other reasons may cause the stomach contents to flow back into the throat. The acidic stomach contents can irritate the throat, causing itchy throat, cough with white sputum. It is recommended that the patient consult a doctor to check the cause of cough with phlegm and treat it under the doctor’s guidance.