Coughing does not necessarily belong to respiratory diseases. Coughing is a reflex mechanism of the body, a self-protective measure of the body to remove respiratory pathogens and harmful substances. However, cough is a respiratory symptom, mostly caused by respiratory diseases, such as acute or chronic respiratory infections, cough variant asthma, etc. However, it may also be caused by other systemic diseases, such as gastroesophageal reflux disease, etc. The cause needs to be clarified by combining medical history, symptoms and auxiliary examinations. I. Common respiratory diseases: 1. Acute and chronic respiratory infections: including upper respiratory tract infections, lung infections, bronchiectasis, etc. Involving viruses and bacteria in the respiratory tract causing inflammation of the bronchial mucosa, which will stimulate the bronchial ciliated cells to swing to promote the discharge of germs and sputum from the airways, i.e., coughing occurs; when combined with bacterial infections, anti-infective treatment such as first- and second-generation cephalosporins can be applied under the guidance of a doctor. In case of combined bacterial infections, anti-infective treatment such as first- and second-generation cephalosporins can be applied under the guidance of the doctor, while symptomatic treatment such as aminobromine hydrochloride oral solution and other phlegmolytic drugs can be used to promote the clearance of germs; 2. Cough variant asthma: coughing symptoms occur due to stimulation of bronchial mucosa by inhalation of cold air, dust and oil fumes, especially at night, and there is often no obvious sputum secretion. 3. Upper airway cough syndrome: Chronic rhinitis, sinusitis, chronic pharyngitis and other upper airway diseases lead to reflux of nasal secretions or postnasal drip, which in turn stimulates the pharynx and trachea with corresponding respiratory irritation symptoms and can cause persistent cough. After the diagnosis is confirmed, drugs such as compound methoxyphenamine capsules can be applied to stop the cough, and the drainage and flushing of nasopharyngeal secretions can be strengthened. Other systemic diseases: 1. Gastroesophageal reflux disease: Cough can occur due to the reflux of gastric acid and other gastric contents into the esophagus and irritation of the pharynx. Symptoms are more pronounced about an hour after meals, often more prominent during the day after meals. After diagnosis, proton pump inhibitors such as omeprazole and lansoprazole, as well as gastrointestinal motility drugs such as domperidone tablets can be applied as prescribed by the doctor to reduce gastroesophageal reflux, along with appropriate cough symptomatic treatment. 2. Psychogenic cough: Cough can also be triggered by psychological factors, such as anxiety and depression, which lead to airway hyperreactivity. General cough suppressant treatment is not effective, and psychological relief and medication are needed for psychological disorders.