Some people occasionally cough a few times, some people cough to their heart’s content, some people cough all the time, and some people usually do not cough, but cough up and die —— In fact, coughing is a protective reflex action, through the cough reflex can effectively remove secretions in the respiratory tract and foreign bodies that enter the respiratory tract from outside, and what we call coughing sputum is to remove pathological secretions in the respiratory tract, with the help of the cough reflex and It is normal to cough to remove pathological secretions from the respiratory tract and to expel them from the oral cavity. What kind of cough should we be alert for? 1. Cough that does not heal: coughing repeatedly, coughing sputum, coughing that does not heal after anti-inflammatory treatment, or coughing that does not heal or even gets worse. 2. Cough with blood in sputum: Patients coughing up blood are commonly found in patients with tuberculosis, bronchiectasis and lung cancer. For patients with repeated blood in the sputum, or without obvious cough but with hemoptysis, these patients need to be alert and promptly examined. 3. Cough with chest pain or chest tightness: when lung tumor invades the pleura, pain will appear, and the pain will gradually increase as the tumor increases; if the lesion is in the lung door or there is pleural effusion, it will cause chest tightness, shortness of breath and difficulty in breathing. What are the characteristics of cough in lung cancer? The cough of lung cancer is often dry and irritating without sputum or with little sputum. When the tumor causes bronchial stenosis, the cough can be aggravated, mostly persistent, with high-pitched metallic sound cough or irritating choking cough. Due to the influence of living environment, the incidence of lung cancer is increasing year by year, which causes psychological pressure to many people, and there are often patients who are afraid that they have lung cancer because of cough. It is not the cough that we need to be careful of, but these special coughs, so please seek medical attention as soon as they appear. To prevent coughing, the first thing you should do is to keep warm, stop smoking and drinking, eat a relatively light diet, avoid exposure to irritating gases, and take part in physical exercise to strengthen your body and improve your resistance to disease.