Proteinuria can be seen by the naked eye, with the increase of protein content in the urine, the urine tension will increase, then the urine will form a large number of bubbles, and due to the increase of protein and the formation of foam, the foam will not dissipate on its own within a period of 10-15 minutes. If the urine contains more protein, it can be detected by visual observation of the foamy urine. However, not all foamy urine suggests an increase in protein content in the urine. There are some cases where foamy urine can occur, such as a high-fat diet and drinking too little water, where an increase in the amount of formed molecules in the urine can also occur, but most of these foams will dissipate quickly over time. You can distinguish whether the foamy urine is proteinuria or foamy urine caused by other reasons by careful observation.