Urinary protein is the presence in the blood of a quantitative amount of protein that is often essential to human life activities. Some of this protein is filtered into the urine by the filopodia of the kidneys, but it is absorbed back into the bloodstream by the renal tubules. Therefore, if the kidneys are functioning normally, only a small amount of protein will appear in the urine, but when the kidneys and the ureters become impaired, a large amount of protein will leak out and become proteinuria. A normal person has a trace amount of protein in the urine, which is characterized as negative within the normal range and is recorded as (-). When the protein content in urine is more than 0.15g/24h, it is called proteinuria, and the urine can be positive for routine characterization. 1. Pathological factors A positive urine protein profile should be noted and should be further examined or reexamined. Continuous positive results, especially when there are more plus signs, suggest that you may have acute nephritis, chronic nephritis, pyelonephritis, renal tuberculosis, renal tumor, nephrotic syndrome caused by various reasons, systemic lupus erythematosus, diabetic nephropathy, inflammation of the urinary tract, rejection reaction after kidney transplantation, etc. The proteinuria that appears may also be caused by certain pathological reactions, such as: high fever, hypertension, cystitis, urethritis, tumor, myeloma, transfusion reaction, etc. 2, physiological factors can cause temporary positive urine protein, such as pregnancy, after strenuous exercise, cold, mental tension, postural changes, rapid growth period of adolescents, etc.; such as urine mixed with vaginal secretions or mixed with sperm, or contaminated by some other substances can also cause false positives, should pay attention to review and observation. 3, other factors Occasionally a positive urine protein measurement result should be observed and re-examined to exclude relevant physiological factors, and consult an internist or do other further tests to determine the cause. All of the above are reasons for positive urine protein, I hope you will pay more attention in your life, once found, you need to go to the hospital.