Urine foam does not disappear for a day, indicating that is may be proteinuria. Under normal circumstances, if foam is visible in the urine, a few minutes foam will disappear for physiological conditions. If the foamy urine never disappears, it is called foamy urine or proteinuria. You can go to the hospital to check the urine routine, to further clarify the diagnosis. There are many clinical causes of foam, the most common are nephrotic syndrome, glomerulonephritis, renal insufficiency, hypertension, diabetic nephropathy and so on. The diagnosis can be clarified through blood routine, urine routine, ionized renal function, liver function, blood lipids, blood glucose, 24hUP quantification and rheumatism and immunity and other related examinations. Active treatment of the primary disease is a good guide to the prognosis, so people with a lot of foam in the urine must go to the hospital for regular treatment.