A little white sputum in the throat may be caused by upper respiratory tract infection, bronchitis, post-nasal drip syndrome and other diseases, it is recommended to go to the hospital in time to clarify the cause of the disease. 1. Upper respiratory tract infection: Upper respiratory tract infection is a general term for acute inflammation of the nasal cavity, pharynx or larynx, which is mostly caused by viruses, and only a few are caused by bacteria. In addition to white phlegm in the throat, patients may also have sneezing, nasal congestion, watery nasal discharge and other symptoms. 2. Bronchitis: Bronchitis is an inflammation of the mucous membrane of the trachea, bronchial tubes and their surrounding tissues, which is mainly related to pathogenic microbial infections, physical and chemical factors, allergic reactions and smoking. Common clinical symptoms include itchy throat, cough, sputum and so on. 3. Postnasal drip syndrome: rhinitis, sinusitis and other secretions increase, reflux to the throat, cough, white sputum and so on. Patients need regular daily routine, do not stay up late, away from smoke, dust, etc., quit smoking and alcohol, eat more food rich in vitamins and other nutrients, avoid spicy and stimulating food, appropriate physical exercise, etc., will help to strengthen the body, promote the recovery of the body. If you feel unwell, you should go to the hospital in time to avoid delaying your condition.