Coughing is a symptom that helps clear secretions or foreign bodies from the airways and is not necessarily related to whether or not pneumonia develops. However, pneumonia can cause patients to experience coughing symptoms. Cough is one of the more common respiratory symptoms in clinical practice. For the organism, cough itself is a kind of defense and protection action, which can help the organism to clear some secretions and foreign bodies in the respiratory tract area. The occurrence of pneumonia depends on the pathogen and the host. Pneumonia occurs when the pathogen is abundant and virulent and/or the host has compromised local and systemic immune defenses in the respiratory tract. Although it is said that most patients with pneumonia experience coughing symptoms, coughing does not necessarily cause pneumonia. If the patient always has a cough, it is recommended to go to the hospital in time to clarify the cause of the disease, under the guidance of the doctor for treatment.