Urine protein positive, what's going on?

Normal urine does not contain protein. Anatomically, protein in the blood enters the original urine through glomerular filtration and is reabsorbed by the renal tubules. However, if the glomerular filtration permeability increases for any reason, a large amount of plasma protein leaks out beyond the reabsorption capacity of the renal tubules, it will form a urine protein positive. Of course, other urinary infections, bleeding caused by bacterial proliferation, will also form a urine protein positive. Therefore, if the urine routine is clearly associated with infection, infection control can be carried out first, and then reexamined. If urine protein is still positive, some diseases of renal internal medicine should be considered, such as nephritis syndrome, nephrotic syndrome, IgA nephropathy, latent nephritis, etc., 24-hour urine protein quantification needs to be checked, and according to the results, the patient should go to renal internal medicine department for treatment.