Pleural effusion is caused by the accumulation of fluid in the pleural cavity, which cannot be completely absorbed simply by exercise, and the specific cause of the disease needs to be eliminated. The causes of pleural effusion mainly include pneumonia, tuberculosis, lung cancer and trauma, etc. Further treatment mainly includes anti-infection treatment, anti-tuberculosis treatment, surgical resection and drainage of pleural effusion. 1. Pneumonia: most of the pleural effusion caused by pneumonia will be relatively small in amount, and most of it can be self-absorbed through the targeted application of anti-inflammatory drugs, commonly used drugs include moxifloxacin, cephalosporin, amoxicillin and so on. 2. Tuberculosis: Tuberculosis can also cause pleural effusion, which requires regular application of anti-tuberculosis drugs, commonly used drugs include isoniazid, rifampicin, etc. If the amount of pleural effusion is large, one can choose to do drainage of pleural effusion. 3. Lung cancer: Lung cancer is also a common cause of pleural effusion, which needs to be relieved by surgical resection of the tumor, and in addition, large amount of pleural effusion needs to be treated with drainage of pleural effusion. 4. Trauma: After trauma, it will directly lead to damage around the pleural cavity, rupture of blood vessels and so on, which will lead to pleural effusion, and most of them need to be treated by drainage. If there is obvious pleural effusion, accompanied by obvious physical decline, chest pain, cough and other symptoms, you need to consult a doctor in time for observation and standardized treatment after diagnosing the specific condition.