Benign tumors in lungs may have compression effect on other tissues, leading to lung infection, dyspnea, shock and other hazards, and may have the possibility of cancerous transformation in the later stage. 1. Compression: if the benign tumor of lung is particularly large, and its diameter is more than 3cm, it will compress the airway and blood vessels, resulting in dyspnea, shortness of breath, shortness of breath and other manifestations. 2. Infection: benign lung tumor compresses lung tissues, airways and blood vessels, poor blood supply to local lung tissues and accumulation of secretion in lungs will easily cause infection and symptoms such as fever, cough and sputum etc., which may be life-threatening if the condition is serious. 3. There is no tendency to transform into malignant tumors: benign tumors of the lungs are not treated for a long time, resulting in long-term infections, lung tissue is stimulated by long-term inflammation, there is a possibility of cancer, benign tumors of the lungs themselves will also have a tendency to transform into malignant tumors. The harm of benign lung tumors to the human body needs to be combined with the symptoms and signs to make a comprehensive judgment, the patient should pay attention to, timely hospital consultation, timely surgical resection if necessary.