The causes of white sputum production are respiratory tract infectious diseases, allergic diseases, interstitial lung diseases and so on. 1. Respiratory tract infectious diseases: such as viruses, mycoplasma and other pathogens infecting the bronchial tubes, trachea and lungs can cause the appearance of white sputum secretion. 2. Allergic diseases: such as bronchial asthma, can cause coughing, coughing up sputum and other symptoms, sputum is often white. 3. Interstitial lung diseases: such as idiopathic interstitial pneumonia, often manifested as irritating dry cough or a little white mucus sputum. In addition, white sputum can also be seen in some patients with cardiac insufficiency, etc. It is recommended that people with white sputum go to a regular hospital in time to clarify the cause, should be standardized treatment under the guidance of the doctor, so as not to delay the condition to the body to bring adverse effects.