Pulmonary effusion is called pleural effusion in medical terminology, depending on what causes the pleural effusion, which is broadly divided into the following causes: a. Inflammatory pleural effusion, inflammatory pleural effusion includes pneumonia-induced parapneumonic effusion. If this is the case by actively treating pneumonia, a small amount of pleural effusion will be gradually absorbed. If the amount of pleural effusion is more and cannot be absorbed on its own, the pleural effusion can be extracted by puncture. Second, the pleural effusion caused by tuberculous pleurisy, this pleural effusion needs to extract pleural fluid, combined with regular anti-tuberculosis treatment, will also slowly cure, generally need to take anti-tuberculosis drugs for more than six months. Malignant pleural effusion is a pleural effusion caused by lung cancer and various extra-pulmonary malignant tumors and pleural metastases, which has no particularly good treatment effect and should be actively treated for the primary disease. If the primary disease can be controlled, pleural effusion can also be controlled. Fourth, various causes of leakage pleural effusion, such as cirrhosis, cardiac insufficiency, nephrotic syndrome caused by the pleural effusion. This kind of pleural effusion is closely related to the original disease, if the original disease improves, the pleural effusion can reduce or disappear by itself. If the amount of pleural effusion is large and causes obvious compression of the lungs, the pleural effusion can be temporarily extracted to reduce the symptoms of lung compression.