Tuberculosis can be completely misdiagnosed as lung cancer. Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis infection, the lung, while lung cancer is a malignant tumor of the lung caused by genetic mutation or other reasons. Although the two are different diseases, clinically, there are great similarities in symptoms, such as coughing, coughing up sputum, blood in sputum, and low fever, so misdiagnosis can occur in the early stage, and the cavities produced by certain tuberculosis have considerable similarity to cancerous cavities. , which is also similar to alveolar carcinoma in lung cancer on chest radiographs and CT of the lung, both show multiple small nodular foci, so there is also a possibility of misdiagnosis. Therefore, the diagnosis of tuberculosis is to obtain a pathological diagnosis, finding Mycobacterium tuberculosis in sputum and tissue fluid, while the diagnosis of lung cancer is to obtain a pathological diagnosis, finding cancer cells in the diseased tissue.