Lung cavity 2cm may be cancer, besides cancer, other lesions may also cause corresponding conditions, common causes include tuberculosis and lung abscess. 1. Lung cancer: lung cancer may appear corresponding condition, and the center of the lesion liquefaction necrosis, generally the edge of the lesion itself is not smooth, the shape is irregular, the overall thickness of the wall of the hole is uneven, part of the wall can be seen nodules. 2. Tuberculosis: tuberculosis can also lead to the corresponding conditions, generally caseous granuloma formation, the center of the pus will appear, after the bronchial drainage will appear the corresponding changes, the lesion itself shows polymorphism, around the satellite foci can be seen. 3. Lung abscess: associated with bacterial infection, the center of the lesion liquefaction necrosis will cause corresponding changes, the corresponding lesion edge is smooth, the cavity wall thickness is uniform, will be accompanied by obvious symptoms of infection. Lung cavity 2cm is recommended to consult the doctor in time, such as accompanied by obvious cough, chest pain and other symptoms, should pay more attention, under the guidance of clinicians for standardized treatment.