Pleural effusion after rib surgery is a normal change in the condition, mainly for the following reasons: 1. Pleural effusion can occur as a result of rib injury, but it may not be obvious before the surgery, and the examination is not obvious because the whole condition is not so fast and not so much. 2. If the lung function is not very good, after the surgery, because of long time bed rest, plus the pain in the rib surgery site, the respiratory movement is not as normal, it is easy to produce pneumonic pneumonia, lung infection, plus the original condition changes, pleural effusion increases, the above situation will be more obvious. 3, if the rib itself is seriously damaged, there is also a possibility of lung contusion, which is also the cause of pleural effusion, the specific treatment plan should be based on the characteristics of pleural effusion and The specific treatment plan should be judged according to the characteristics of pleural effusion and the clinical symptoms produced.