Cavity shadow in the right lower lung without cough or sputum is usually a manifestation of tuberculosis, but it may also be lung abscess, lung cancer and other diseases. 1. Tuberculosis: Tuberculosis is usually caused by mycobacterium tuberculosis infection, low immune function, etc. It may have fever, insomnia and other symptoms, and may also lead to no cough, no sputum, and hollow shadow in the right lower lung. 2. Lung abscess: Lung abscess is usually caused by low immunity, bacterial infection, etc. It may have symptoms such as high fever, fatigue, etc., and may also lead to the condition of hollow shadow in the right lower lung without cough or sputum. 3. Lung cancer: Lung cancer may cause symptoms such as wheezing, hoarseness, etc. It may also cause hollow shadow in the right lower lung without cough or sputum. It is suggested that patients should go to the hospital for examination in time and take standardized treatment under the guidance of doctors.