Metastasis of right lung tumor into the lung is a symptom of cancer, and metastasis is a characteristic of malignant tumors, so attention should be paid to it. Metastasis of right lung tumor into lung belongs to the phenomenon of cancer. The appearance of metastasis indicates that the tumor is not occurring in the early stage, but may have already belonged to the middle or late stage, and it is necessary to judge whether there is metastasis in other parts through PET-CT, pathological biopsy and other examinations, while the metastasis of right lung tumor into lung, this phenomenon belongs to the phenomenon of direct diffusion. The cancer can grow along the bronchial lumen and bronchial wall, can block part of the bronchial lumen or all of it, and invade into the neighboring lobes through interlobular fissures, and after that, it can break through to the visceral pleura to cause implantation metastasis in the pleural cavity, and also invade the mediastinum, the chest wall, and other organs, so it is necessary to consult the doctor in time.