Laboratory urine if there is urine protein (+), it suggests the existence of proteinuria, which is often due to glomerular, tubular damage to various functions, which leads to the emergence of proteinuria, may also be seen in incidental proteinuria, functional proteinuria, overflow proteinuria, and so on, you need to carry out the relevant tests to clarify the specific causes, the possible causes: 1, renal tubular proteinuria, because of infections, poisoning caused by tubular The proteinuria of the renal tubules, because of the damage caused by infection, poisoning, and lead to the tubular reabsorption of protein obstacles, the urine can appear a little bit of protein, protein qualitative mostly between (+) to (++), and accompanied by a certain amount of inflammatory damage, can be further quantitative detection of protein. 2, glomerular proteinuria, this is a relatively common type of proteinuria, often seen in nephritis or nephrotic syndrome, kidney damage, and so on, which causes the renal filtration membrane damage, leading to proteinuria spillover. This is often seen in nephritis or nephrotic syndrome, kidney damage, resulting in damage to the renal filtration membrane, leading to proteinuria overflow. In this case, in addition to quantitative urine protein, but also to do renal function or immune function test, clear whether the combination of renal injury. 3, when the body’s protein content exceeds the normal indicators, there may be overflow proteinuria, such as muscle injury and lead to myoglobin increase; hemolysis and other changes, resulting in free hemoglobin elevation and so on, can cause the appearance of protein in the urine, need to be further examined in order to clarify the most important reasons. Further examination is needed to clarify the most important cause.