Foamy urine that is larger, more frequent, and lasts longer suggests a higher likelihood of nephritis. The main symptoms of nephritis are hematuria, proteinuria, edema, and hypertension. Proteinuria is found from routine urine tests, but there are also some clinical signs that suggest the possibility of urine protein, and that is foamy urine. In normal people, there is a small amount of foamy urine in the urine, but the foam is relatively small and small in number, and lasts for a relatively short time, basically subsiding within ten minutes. However, the foam caused by urine protein is larger and more numerous, like laundry detergent being washed up, and lasts longer, not subsiding after half an hour or even an hour. If you find this kind of foam in reality, then it is more likely to consider proteinuria, suggesting that you may be suffering from nephritis, but to confirm the diagnosis, you have to perform a routine urine test.