A pleural effusion that is brought under control usually means that the condition has shown improvement. Pleural effusion may be due to infection or tumor. Patients will have symptoms such as chest tightness, shortness of breath, cough, dyspnea, etc. After the pleural effusion is controlled and reduced through self-absorption or continuous closed drainage through thoracentesis, the symptoms of chest tightness and shortness of breath will show significant improvement, which is a sign of improvement of the condition. It can also be confirmed by imaging examination. Patients should keep their living place dry and not overeat in daily life. Daily diet should be based on light, carbohydrate and protein. It is recommended that patients go to the hospital in time for checkups and follow-ups, and when discomfort occurs, consult the doctor in time and treat it actively so as not to miss the condition.