Metastatic lung cancer refers to malignant tumors in all organs of the body, whose cancer cells or embolus spread through blood line metastasis and continue to grow in the lungs, which is a manifestation of advanced stage of the tumor. The lymph and veins of the whole body organs return to the vena cava, and then supply to the organs through the pulmonary circulation to the body circulation, so the lungs are the most prone to tumor metastasis except for the lymphatic system in the human body. Malignant tumors in the neck and mediastinum can also be metastasized to the lungs through lymphatic retrograde, and malignant tumors can also be metastasized to the ipsilateral or contralateral lobes of the lungs through hematogenous and lymphatic pathways. Usually, metastatic lung cancer is multiple lesions, but there are also cases of a single isolated nodule. In terms of treatment, doctors will choose an individualized treatment plan based on the status of the primary malignant tumor, the type and location of metastatic lung cancer, and the patient’s own condition, which mainly includes surgical treatment, radiotherapy and chemotherapy. In case of metastatic lung cancer, it is recommended to seek medical treatment in time and carry out standardized treatment under the guidance of doctors.