Pleural effusion may increase the more fluid is pumped. Causes of pleural effusion include trauma, inflammation, cancer, etc. The treatment effect after fluid extraction varies according to the cause of the disease, and most of the effusion will become less and less the more the fluid is extracted, and in a few cases, the fluid will become more and more the more the fluid is extracted. 1. Trauma: after trauma, pleural cavity blood vessel injury, blood vessel wall permeability change will appear pleural effusion, after symptomatic treatment, pleural effusion can be self-absorbed, such as hemothorax, and blood vessels continue to bleed, there may be a hemothorax again after pumping, the more the more the situation, the need for timely surgical hemostasis. 2. Inflammation: after inflammation and infection, pleural effusion may appear because of inflammatory exudation, after applying antibiotics and pumping fluid for treatment if necessary, pleural effusion can disappear quickly, such as tuberculous pleurisy patients with high protein content in pleural effusion, which is easy to cause pleural adhesion, so it should be pumped out as soon as possible, to prevent or alleviate the adhesion, and at the same time, it can lift the pressure on the heart, lungs and blood vessels, so as to make the compressed lungs rapidly re-tensioned and improve the respiration and alleviate the symptoms of tuberculosis poisoning. At the same time, it can relieve the pressure on heart, lungs and blood vessels, make the compressed lungs reopen rapidly, improve breathing and reduce the symptoms of tuberculosis poisoning. 3. Cancer: pleural effusion caused by malignant tumors can reduce the symptoms of dyspnea after fluid extraction, but the amount of pleural effusion grows faster, and it is impossible to treat pleural effusion by fluid extraction. There is a large amount of albumin in pleural effusion, and the amount of fluid extraction is large, and the malignant tumors invade, which makes the patients’ physical condition getting worse and worse, and it will appear that more and more pleural effusion will be extracted. People with large amount of pleural effusion should not pump more than 700ml of fluid for the first time, and pump 2 to 3 times a week, and the amount of fluid pumped each time should not be more than 1,000ml, and try to pump as much as possible at one time if it is a pus thorax.