Interstitial fluid refers to the presence of a lot of fluid between the intestines, and there are many kinds of fluid properties, such as inflammatory fluid, purulent fluid, blood or tissue exudate. It is necessary to go to the hospital to further improve the relevant examinations, such as blood routine, liver function, ionization full, glucose determination, hepatitis B five, infection four, as well as tumor markers of alpha-fetoprotein, carcinoembryonic antigen, glycan antigen 19-9, and so on. If the amount of fluid is large, abdominal puncture can be performed to drain the fluid out of the body, and laboratory tests can also be sent to see the nature of the fluid. If it is considered to be due to infectious factors, antibiotics need to be given aggressively for treatment, and sometimes surgery is also needed. If cancerous ascites is considered, we need to actively search for the primary tumor, and then do radical resection of the tumor, which may need to be combined with chemotherapy, targeted drug therapy and traditional Chinese medicine in the later stage.