Cough sometimes has phlegm, sometimes it doesn't. Cough can remove foreign bodies or secretions from the lungs, which is a reaction to congestion in the lungs. Some are because the lungs or larynx are stimulated by smoke, catching cold or allergic; It may also be due to serious diseases of the lung and cardiovascular system, so don't ignore it. 1. Symptoms: dry cough, hoarseness or aphonia. The patient is over 40 years old and has a habit of smoking. There is no other reason. Possibility: Although there are many reasons for hoarseness or aphonia, it should be suspected that the abnormal pronunciation changes over a long period of more than one week and the smoking habits of patients are the possibility of cancer. Handling: See a doctor quickly. The doctor should do a biopsy. If laryngeal cancer is confirmed, early treatment is beneficial to the patient. 2. Reason: I accidentally sucked a little food crumbs into my lungs. Treatment: Cough is the body's response to foreign bodies entering the airway, with the aim of trying to remove the sucked foreign bodies. If you don't cough for more than 1 hour, you should see a doctor. 3. Reason: I smoked a little smoke or chemical gas. Treatment: Leave the place where there is smoke and chemical gas, and it will be all right soon. If you have a persistent cough or shortness of breath, see a doctor. 4. Symptoms: I started coughing a few days ago, and now I have a runny nose or a sore throat. Possibility: I caught a cold. Treatment: Rest more, drink more water, and take aspirin or acetaminophen if necessary. 5. Symptoms: cough, fever, dyspnea and brown sputum. Possibility: Acute respiratory infection (such as pneumonia or acute bronchitis) is very dangerous for the elderly and the infirm. Treatment: Seek medical attention immediately. The doctor may have to have an X-ray examination and be hospitalized. 6, symptoms: dry cough for more than a month, no other symptoms. Possibility: Inflammation of trachea, which may be caused by allergy and smoking. If the patient is over 40 years old and smokes, the possibility of lung tumor should also be considered. Treatment: see a doctor at once. Doctors should first X-ray the patient's lungs, peep into the trachea and check the cause of cough. Only when the diagnosis is correct can symptomatic treatment be carried out. 7. Symptoms: I started coughing a few days ago, and now I have a fever, with a fever above 38℃ and shortness of breath. Possibility: acute bronchitis. Treatment: Take aspirin or acetaminophen to lower the body temperature, go to the drugstore to buy some cough medicine to help relieve cough, and take antibiotics if necessary. Keep the indoor humidity. If you don't get better after 48 hours, or if you have difficulty breathing, see a doctor. 8, symptoms: cough, sputum is gray or yellow-green. Possibility: chronic bronchitis. Treatment: Doctors may use antibiotics, and smokers should give up smoking. 9, symptoms: dry cough for several months, and the more coughing, the worse. Possibility: It may be chronic bronchitis, tuberculosis or lung cancer. Treatment: The doctor will have a chest X-ray examination and possibly a bronchoscopy. Diagnosis must be made before treatment.

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