Lung tumor 7 cm is not very serious if it is benign, but very serious if it is primary lung cancer or lung metastasis. Benign lung tumors include malignant tumors, fibrous tumors, hemangiomas, smooth muscle tumors, etc., which are relatively rare clinically, but most of them have a good prognosis and will not recur after surgical resection. Larger benign tumors carry the risk of rupturing and bleeding, causing hemopneumothorax, etc. Early surgical treatment is recommended. Primary lung cancer 7 cm should be classified as T3 stage, and the clinical staging is at least IIB stage or above, if combined with lymph node metastasis, the staging will be even later, especially many non-small cell lung cancer patients have lost the chance of radical surgery when they are found, and the condition is relatively serious. Metastatic lung tumor 7cm indicates that the patient is already in the advanced stage of cancer, and the treatment is relatively difficult, and is based on comprehensive treatment, including chemotherapy, radiotherapy, targeted therapy, immunotherapy, etc. The significance of the treatment is to prolong the survival time of the patient as much as possible and improve the quality of life. Giant lung metastases may cause cough, hemoptysis, dyspnea, hemopneumothorax and other manifestations or complications. It is recommended to go to the hospital as soon as possible to consult the doctor and be treated accordingly under the guidance of professional doctors.