The phlegm sound does not necessarily mean that it is serious, it depends on the specific situation. Patients with mild symptoms may just have secretions in the bronchial tubes, which leads to phlegm sound, while more serious patients may have bronchitis, pneumonia and other diseases.
Sputum sound is a sound produced by gas passing through the bronchial tubes and vibrating against its secretion. If there is no fever or chest tightness, it is usually not important, but if there is no relief for a long time, sputum sound keeps appearing, and the symptoms of coughing and sputum are heavy, and the persistent low-grade fever is persistent, you may have pneumonia or bronchitis.
Either way, you need to go to the respiratory medicine department of the hospital in time, complete the relevant examinations under the guidance of the doctor, and cooperate with the doctor to actively treat.