Whether or not it is normal to still cough 4 months after lung adenocarcinoma surgery is a case-by-case situation and should not be generalized. It is important to distinguish whether it is a general postoperative reaction or lung or airway infection. After lung adenocarcinoma patients have their lesions removed by surgery, due to the change of lung structure and the stimulation of surgical sutures, it may lead to persistent coughing and other symptoms. However, cough at this time is a normal complication after lung adenocarcinoma surgery, and usually does not need too much special treatment. In addition, since patients with lung adenocarcinoma are weaker after surgery and their immunity level is usually lower, they are prone to lung and airway infections after surgery, and the cough at this time is abnormal, which should be combined with specific tests and diagnostic means to differentiate it from the cough caused by general postoperative reactions.