There are many reasons for coughing up white sputum once you get cold, commonly found in chronic bronchitis, upper respiratory tract infections and so on. 1. Chronic bronchitis: this is a non-specific inflammation, coughing is often dominated by white sputum, due to exertion, cold and other triggers, if the duration is longer than 3 months, considering chronic bronchitis, you can take medication, such as Suhuang cough capsule, compound licorice tablets, lung cough, and so on. 2. Upper respiratory tract infection: mostly caused by viral infections, the onset of disease is more acute, the main manifestations of nasal congestion, cough, dry throat, cough white sputum. Treatment is symptomatic and antibiotics are not necessary. When there is a cough with white sputum, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, under the guidance of the doctor for treatment.