If the pleural effusion has been drawn 3 times and there is still fluid, you can continue to extract the fluid, drain the intercostal tube, and perform pleural fixation, etc. Pleural effusion should be treated according to the cause of the disease. If the pleural effusion has been withdrawn 3 times and there is still fluid in the chest, you can continue to withdraw the fluid, if the pleural effusion is purulent, you can carry out pleural cavity irrigation; if the pleural effusion is generated too quickly, you can put a tube between the ribs to drain; you can also carry out pleural immobilization, i.e., injecting talcum powder into the pleural cavity in order to minimize the recurrence of the pleural effusion and other treatments to alleviate the symptoms of respiratory distress caused by the pleural effusion. There are many causes of pleural effusion, common causes include malnutrition, infection, cardiac insufficiency, malignant tumors, etc. When pleural effusion occurs, it is usually necessary to treat the primary cause.