If there is coughing, chest pain, chest tightness, shortness of breath, sore throat, etc. If there is simply only coughing and no other symptoms, consider acute bronchitis, mostly due to inflammation of the trachea and bronchial mucosa caused by infection with germs, including fungi, bacteria, viruses, etc. after getting cold. For treatment, if there is no sputum, you can take oral dextromethorphan or diphenhydramine hydrochloride tablets for cough suppression. If there is phlegm that cannot be easily coughed out, oral aminoglutethimide tablets can also be taken to dissolve the phlegm. If possible, you can nebulize saline or relieve the spasm of airway. Pay attention to rest, prevent cold, increase personal nutrition, appropriate activities, and enhance personal physical fitness. If the results are not good, promptly perform chest X-ray and blood tests to understand the condition of the lungs and the degree of inflammation.