Fluid in the stomach is often caused by the following reasons: 1. abdominal cavity infection, when the infection in the abdominal cavity is more serious, there will mostly be a lot of inflammatory fluid or purulent fluid, which needs to be examined in the general surgery and gastroenterology departments of hospitals. If it is considered to be caused by something like cholecystitis or appendicitis, it needs to be actively treated with antibiotics and, if necessary, surgery. 2. It may be caused by malignant tumors, such as malignant tumors of the intestine, malignant tumors of the liver, etc. It needs to be clarified by gastroenteroscopy, abdominal CT, tumor markers, liver function, etc. It usually requires radical resection of the tumor, followed by lymph node dissection. 3.It may be caused by poor nutrition, such as hypoproteinemia, which requires active intake of nutritious substances, and sometimes requires nutritional solution and albumin for treatment.