What causes long-term yellow urine foam?

Male long-term urine yellow foam, first need to go to the hospital for examination, clear diagnosis of the cause. Can do urine routine examination, and then observe whether urine bile original increased, urine week whether there is urine protein, whether there are red blood cells, whether there are white blood cells and whether there is urine sugar. To initially diagnose the cause. Because of long-term urine yellow foam, there may be due to liver disease caused. After liver disease can cause bilirubin into the blood, through urine excretion, can cause yellow urine, showing foam. Nephritis contains proteinuria, can also show foam. Urinary infection, due to bacterial infection, can cause urine to show foam. Diabetes patients because urine contains sugar, can also cause urine to show foam phenomenon.