Pleural effusion pumped out is yellow water may be hypoproteinemia, congestive heart failure, tuberculous pleurisy and so on. 1. Hypoproteinemia: plasma albumin will decrease in patients with hypoproteinemia, and at this time, the generation of fluid in the chest cavity will also increase, which is easy to form pleural effusion. At this time, the patient’s pleural effusion is aspirated, and the color of the extracted effusion is mostly yellow. 2. Congestive heart failure: the hydrostatic pressure of pleural capillaries will increase when the patient has congestive heart failure, if the pressure inside and outside of the patient’s blood vessels is not balanced, it will lead to the leakage of intravascular fluid into the pleural cavity, and at this time, the appearance of the pleural fluid extracted is clear, and the color is yellowish or transparent. 3. Tuberculous pleurisy: Tuberculous pleurisy is caused by Mycobacterium tuberculosis infection, and patients will have chest pain, dyspnea, fever and other symptoms. Moreover, when the patient aspirates the pleural fluid for examination, the pleural fluid is usually straw-yellow in color. Pleural effusion aspirated is yellow water need to consult a doctor in time, you can clarify the cause of the disease under the guidance of the doctor, choose the appropriate treatment measures.