Whether or not to draw fluid from pleural effusion needs to be based on the cause of the disease, a small amount of pleural effusion, no need to puncture and draw fluid, and a large amount of pleural effusion, it is better to carry out thoracic aspiration. There is a small amount of fluid in the pleural cavity itself, which plays a lubricating role. Its production and absorption maintain a certain balance, and when lesions occur, including trauma, inflammation, tumor, malnutrition, etc., a pleural effusion can be formed. When the balance is disturbed, pleural effusion can be formed. When pleural effusion is excessive, it can compress the lung tissue, leading to symptoms such as dyspnea and chest tightness. A small amount of pleural effusion (less than 10 millimeters thick in the lateral position) or a typical pneumonia-type pleural effusion can be treated conservatively without the need for thoracentesis. When a large or moderate amount of pleural effusion occurs, and the patient has obvious symptoms of respiratory impairment such as dyspnea and chest tightness, thoracentesis and aspiration or closed chest drainage is required, which is more conducive to the recovery of the disease. Discovery of pleural effusion, you can promptly consult a doctor to clarify the cause of the disease, under the guidance of a professional doctor, standardized treatment.