Urine protein (++) indicates that there is protein inside the urine. Under normal circumstances, there is basically no protein in the urine, so the normal results of routine urine tests are negative. If there is urine protein (++), we should go to the hospital to clarify the causes of proteinuria: first, physiological proteinuria, seen after strenuous exercise or fever patients, this type of proteinuria after a period of time will be able to improve on their own, so there is no need to worry too much; the second, renal disease, such as glomerular disease, in the clinic acute nephritis, chronic nephritis, etc. can lead to proteinuria. The second is renal diseases, such as glomerular diseases, acute nephritis and chronic nephritis can cause proteinuria. There are also tubular diseases, such as tubular reabsorption dysfunction, which can lead to an increase in proteinuria. There may also be secondary renal diseases, such as diabetic nephropathy, systemic lupus erythematosus nephritis and tumor-associated nephropathy, which can lead to urine protein (++).