Occupying lesion in the lower lobe of the right lung is a descriptive diagnosis, a diagnostic result of CT examination, and the corresponding conditions include lung cancer, lung abscess, tuberculosis ball, and vascular malformation. 1. Lung cancer: lung cancer will cause soft tissue mass formation in the lungs, resulting in occupying lesions. 2. Lung abscess: it is mainly caused by infection, because of the formation of surrounding fibrous granulomatous tissue wall, it will also form occupying lesion, and the inside of the lesion is mainly liquefied necrotic tissue. 3. Tuberculosis ball: belongs to the formation of tuberculosis caseous granulation tissue, smooth edges, some will be accompanied by calcification and the formation of satellite foci around. 4. Vascular malformation: vascular malformation aggregated into a mass of changes, may also be manifested as occupying lesions, intensified examination can be found in tortuous dilated blood vessels. In addition, chronic inflammation, mycobacterial infection, silicosis, etc. can also cause corresponding changes, which need to be combined with clinical symptoms and imaging examination to make a comprehensive judgment. Occupation of the lower lobe of the right lung is accompanied by obvious cough and chest pain, and requires prompt medical observation and standardized treatment after diagnosis of the specific condition.