There is a layer of oil on the top of the urine, which may be related to diet, or it may be caused by the leakage of lymphatic fluid. If you eat a lot of greasy food, too much fat to digest and absorb, may be part of the fat through the kidneys into the urine, so you can see the oil on the surface of the urine, adjust the diet, drink more water, eat less greasy food, eat more fresh vegetables and fruits, the symptoms will be significantly improved. Urinary system tuberculosis, tumor, retroperitoneal malignant tumor can destroy the lymphatic vessels around the urinary tract, and the lymphatic fluid can enter into the urine, resulting in more grease in the urine. If infected with filarial worms, it can destroy the lymphatic system adjacent to the urinary tract, which can lead to celiac disease, where a large amount of lymphatic fluid can enter the urinary tract and get into the urine, leading to a large amount of fat in the urine. Rule out physiologic factors, and go to the hospital for relevant tests to rule out lymphatic system pathology.