A small amount of fluid in the abdominal cavity caused by trauma or infectious fluid is generally not serious, but it cannot be ruled out that it is caused by tumor. If it is caused by trauma, the small amount of fluid in the abdominal cavity can be absorbed by itself, which is not too serious; if it is caused by infected abdominal fluid, after controlling the infection, the fluid can be absorbed slowly, and the prognosis is generally better, which is generally not serious. However, a small amount of fluid in the abdominal cavity cannot be excluded to be caused by liver cancer, gallbladder cancer, gastrointestinal tumors, etc. Most of the patients can be accompanied by yellowish coloring of skin and sclera, spider nevus, stomach discomfort, abnormal bowel movement, etc. If early and active treatment is given, it is not serious, but if it is not detected in time, it will be more serious. A small amount of fluid in the abdominal cavity has many causes, and it is important to take treatment under the guidance of a doctor to avoid delaying the condition.