White sputum suggests that chronic bronchitis, chronic pharyngitis and acute respiratory tract infections may be present. 1. Chronic bronchitis: chronic non-specific inflammation of bronchial mucosa due to smoking, infections, dust and chemicals, etc. Inflammation can stimulate the bronchial secretion increase, which can lead to coughing, coughing up sputum and other symptoms. 2. Chronic pharyngitis: it can lead to local congestion and edema, which makes the mucosal tissue of the throat produce more secretions, and can also lead to patients coughing up white sputum symptoms. 3. Acute respiratory infections: acute respiratory infections are mostly caused by viruses, early symptoms can begin to appear 10-12 hours after infection, and can last up to 3 weeks, such as the common cold or influenza, can cause coughing and coughing up white sputum. Patients are advised to go to a specialized hospital to identify the cause of the disease and to be treated under the guidance of a doctor.