If lung adenocarcinoma is misdiagnosed and the targeted drug is taken, it needs to be handled in conjunction with the patient’s condition. If there is no discomfort or the symptom is mild, the patient can be left alone and be closely observed; if the discomfort is more serious, the patient needs to be treated symptomatically. 1. Patients without discomfort: Targeted drugs are relatively precise and can specifically kill cancer cells, with less toxic side effects. If patients are misdiagnosed and there are no cancer cells in the body, generally there will be no serious damage to the patient’s body, so if the patients do not have any discomfort, they can be treated without treatment, and can be closely observed. 2. Discomfort of patients: After the application of targeted drugs, patients may experience dizziness, nausea, vomiting and other discomforts. If the discomfort is mild, there is no need to deal with it for the time being, and it is enough to take a good rest and observe closely. If the discomfort is more serious, it is necessary to carry out relevant examinations such as blood routine, abdominal ultrasound, etc. to clarify the specific damage, and use drugs such as omeprazole, bismuth potassium citrate, etc. for symptomatic treatment if necessary. Patients in close attention to their own physical condition at the same time, can be appropriate to drink more water, more exercise, enhance the body metabolism, in order to metabolize the drug as soon as possible to discharge.