To determine whether the lung tumor is malignant or benign can be judged by imaging examination, tumor markers, pathological examination, glycoprotein examination and so on. 1. Imaging examination: benign tumors generally have clear, smooth and even shapes in imaging examination. Malignant tumors usually have fuzzy edge lines, uneven and uneven shapes on imaging, and most malignant tumors are single tumors. 2. Tumor markers: carcinoembryonic antigen will show increased value in malignant tumors of lung. 3. Pathological examination: such as puncture biopsy, excisional biopsy, genetic examination of pathological tissues, sputum exfoliative cytology, etc. The benign and malignant nature of the tumor can be examined by laboratory specimens, and pathological examination is the gold standard. 4. Glycoprotein: patients with malignant tumors of the lungs will have increased α-acid glycoprotein. Benign tumors usually grow slowly, and when the tumor grows too big, it may lead to symptoms such as dyspnea and chest tightness; while malignant tumors grow and multiply fast, and in the later stage, it may lead to symptoms such as emaciation, loss of appetite, coughing up blood, chest pain and so on.