The presence of irregular nodular shadows in the upper end of the right lung may be due to tuberculosis, lung infection, lung cancer, etc. 1. Tuberculosis: Tuberculosis is a respiratory infectious disease that occurs in the lung tissue, trachea, bronchus and pleura caused by Mycobacterium tuberculosis infection.CT will show irregular nodular shadows when tuberculous balloon lesions are present, and a variety of caseous lesions are absorbed and caseous cavities are healed obstructionally, or peripheral fibrous membranes are wrapped. Most of the nodular shadows found in CT examination of the lungs are less than 3 cm, and regular anti-tuberculosis drug treatment is required. 2. Lung infection: Lung infection is an infectious disease of the terminal airways, alveoli and interstitium. The appearance of nodular shadow of lung caused by inflammation may shrink or even disappear after active anti-infection treatment. 3. Lung cancer: Generally, the nodules are less than 8mm, and the short-term increase in density and diameter suggests the possibility of malignant tendency, such as bronchopulmonary cancer, alveolar cell carcinoma and other malignant diseases, which appear as irregular nodular shadows on the right upper end of the lung. There are many reasons causing irregular nodular shadow at the upper end of the right lung, patients should go to the hospital immediately, complete relevant examinations to clarify the cause of the disease, and actively cooperate with the doctor’s treatment to avoid further aggravation of the condition.