The most common is the acute attack of chronic bronchitis and left-sided lung infection caused by long-term smoking, and the corresponding anti-inflammatory treatment is usually given, and antibiotics are given for bacterial infections, such as penicillin, amoxicillin, cefuroxime, and levofloxacin. In addition, intercostal neuralgia caused by left-sided intercostal neuritis can be treated with appropriate analgesic and anti-inflammatory drugs such as aspirin, ibuprofen, acetaminophen, diclofenac sodium, etc. Nerve-nourishing drugs such as B-complex vitamins, glutamate, etc. can also be given. Clinically, because smoking is also seen in malignant tumors of the left side of the lung, early surgical resection should be performed, and radiotherapy and chemotherapy should be given.