There are many reasons for the phenomenon of fluid in the chest, and it is necessary to choose the appropriate treatment according to the specific cause. First of all, the most common cause refers to pleural effusion caused by infection, which is often caused by common viral or bacterial infection. For viral infections, anti-infective treatment can be given intravenously with Xiyampin or Ribavirin. If the amount of pleural effusion is large, puncture and drainage is also required. If a pleural effusion due to tuberculosis occurs, treatment is more troublesome and often requires specialized anti-TB treatment and isolation at a specialized TB hospital. If a pleural effusion is caused by a lung tumor, the treatment is often more complicated. First, the type and location of the tumor can be diagnosed to see if surgical treatment is possible, and it is best if surgical treatment is possible.