The high incidence of lung cancer has always been a cause for concern, and at the same time, people do not have a deep understanding of lung cancer. I hope that it can help you to have a deeper understanding of lung cancer disease. Lung cancer (lungcancer), short for primary bronchogenic carcinoma, is a disease in which tumor cells originate from bronchial mucosa or glands, often with regional lymph node metastasis and hematogenous dissemination, and early respiratory symptoms such as irritating cough and blood in sputum are often observed. Lung cancer is currently one of the most common malignant tumors around the world, and is a serious threat to people’s health and lives. There is a general pattern of the incidence sites, i.e. right lung is more than left lung, upper lobe is more than lower lobe, and cancer can occur from main bronchus to fine bronchus. According to the different sites of lung cancer, lung cancer is clinically classified into three types: central lung cancer, peripheral lung cancer and diffuse lung cancer. lung cancer. Lung cancer originating from bronchial mucosa epithelium and confined to the basement membrane is called carcinoma in situ, which can grow into the bronchial lumen or/and adjacent lung tissues, and can spread through lymphatic blood flow or transbronchial metastasis. The growth rate and metastatic spread of carcinomas are related to the biological characteristics of carcinomas such as histological type and degree of differentiation. The meaning of lung tumors is quite broad. However, the percentage of lung cancer among lung tumors is very high and should be highly alerted. Lung cancer only refers to malignant tumors formed by epithelial cells in alveoli and bronchi at all levels, while tumors in other tissues of the lung are not lung cancer. In other words, lung cancer is a kind of lung tumor, and lung tumor includes lung cancer, but not necessarily lung cancer. Benign tumor of lung refers to the cells constituting tumor are similar to normal cells, but their tissue structure is different from normal tissue structure, without the function of normal tissue, and the cells proliferate abnormally and accumulate into lumps, forming tumor-like malformation; however, such cells proliferate slowly, do not spread to the whole body and do not metastasize. Some of the more common benign tumors in the lung are malignant tumors. From the name of this tumor, we can know that it is caused by the misgrowth of tissue structure. The misshapen tumor in different patients can be composed of different proportions of cartilage, glands, smooth muscle, blood vessels, fat and fibrous tissue. Sometimes only small pieces of tissue are taken for examination and can be differentiated from other benign tumors such as chondromas, smooth muscle tumors, hemangiomas, lymphangioleiomas, lipomas, fibromas, neurogenic tumors, and benign teratomas. In addition, there are rare benign mesothelial cell tumors such as inflammatory pseudotumors, sclerosing hemangiomas, and tuberculomas, as well as nodular disease, bronchopulmonary cysts, and other granulomatous diseases that look like tumors. In addition to lung cancer, malignant lymphoma, lung cancer sarcoma (squamous carcinoma with fibrosarcoma-like components), pneumoblastoma, lung sarcoma (including smooth muscle sarcoma, fibrosarcoma, rhabdomyosarcoma, liposarcoma, angiosarcoma, chondrosarcoma, etc.), malignant papillomatosis, malignant mesothelial cell carcinoma, malignant neurogenic tumor, malignant teratoma and malignant malignant malignant tumor. From the article, we can easily find that lung cancer is one of the lung tumors, so lung tumor is not equal to lung cancer, so please ask about this point in time.