Pleural thickening and adhesion is the result of the accumulation of fibrin-like substances that cannot be absorbed, and may not require treatment if there is no special discomfort. Pleural thickening and adhesion belongs to a kind of local pleural lesions in the chest cavity, most of which are the consequences of long-term stimulation by various pathological causes, mainly inflammation, tuberculosis, tumor, trauma, infection and other causes. Pleural thickening and adhesion is initially caused by fibrin deposition and pleural thickening due to the stimulation of various causes mentioned above, and then triggered by adhesion, the degree of adhesion can be mild or severe, if it is mild, there is no special discomfort, and no abnormalities are seen in other related examinations, then no special treatment is needed. Severe adhesions, which may affect respiration or discomfort, or combined with tumors, inflammation, tuberculosis, etc., need further related formal treatment.