The limited thickening of the right pleura is considered to be possibly caused by pleural effusion, pleurisy, and pleural mesothelioma. 1. pleural effusion: pleural effusion refers to the presence of more fluid in the space between the lungs and the chest wall, and pleural thickening may occur after chest radiography due to the presence of more fluid in the interpleural space. 2. pleurisy: infection of the pleura by a variety of pathogens may cause inflammation of the pleura and thickening of pleural adhesions. 3. pleural mesothelioma: pleural mesothelioma is a rare disease, which can be triggered by long-term inhalation of asbestos fibers and repeated episodes of lung disease. Thoracic mesothelioma is commonly found in the right thoracic cavity, and limited thickening of the right pleura can be observed during examination. It is recommended that the patient go to the hospital to complete the relevant examinations to clarify the specific causes of the disease, and the doctor will formulate a personalized treatment plan according to the condition to treat the disease.