Increased retroperitoneal fat density may be caused by local inflammation, hyperplasia, dietary habits, tumor metastasis and other reasons. 1. Local inflammation and hyperplasia: when inflammation or hyperplasia occurs in the mesenteric fat, it may be manifested as higher than normal retroperitoneal fat density, and may be accompanied by abdominal mass, fever, abdominal pain and other symptoms. 2. Dietary habits: some patients may prefer greasy food, which may lead to increased retroperitoneal fat density, and may also be related to heavy drinking and smoking, so they should adjust the healthy dietary structure, eat more fresh fruits and vegetables, and prohibit smoking and alcohol. 3. Tumor metastasis: when there is tumor metastasis, the phenomenon of increased retroperitoneal fat density will also occur, usually accompanied by local lymph node enlargement and so on. Increased retroperitoneal fat density can also be seen in other reasons, which should be promptly consulted and standardized treatment under the guidance of professional doctors to avoid delaying the condition.