Hidden pain in the left lung after smoking is usually caused by pneumonia, left-sided bronchitis, pleurisy and other diseases. 1. Pneumonia: nicotine in tobacco will stimulate the mucous membrane of the lungs after smoking, which can aggravate pneumonia and lead to breathlessness, pain and other symptoms, patients can take amoxicillin, cefaclor and other drugs under the guidance of a doctor, don’t take drugs after drinking, and allergic people are prohibited. 2. Left-sided bronchitis: nicotine produced by smoking will stimulate the left side of the bronchial tubes, inducing bronchitis, coughing, pain and other symptoms. Patients can take medicines such as Roxithromycin and Levofloxacin under the guidance of doctors, but allergic people are forbidden. 3. Pleurisy: patients smoking left lung pain may be due to long-term smoking patients caused by the body resistance becomes poor, easy to occur tuberculosis pleurisy, patients can take pyrazinamide, ethambutol and other drugs under the guidance of a doctor, but also patients should quit smoking in a timely manner, to prevent exacerbation of the condition. The above drugs should be used under the guidance of a physician, the left lung pain after smoking may also be angina pectoris, costal neuritis and other causes, the patient should go to the hospital in a timely manner for examination, in life should quit smoking and prohibit alcohol, to prevent deterioration of the condition.