A urine protein (+) on physical examination suggests the presence of proteinuria, and further 24hUP quantitative examination is recommended. There are many causes of protein(+), which may be: First, a high protein diet can cause transient proteinuria, so it is recommended to stop the high protein diet and then review the urine routine. Second, excessive exercise or trauma can cause a transient increase in proteinuria. It is recommended to retest again, stop the exercise, or wait for the injury to the lower back or abdomen to heal before retesting. Third, various kidney diseases can lead to elevated urine protein. It is recommended that a 24hUP quantitative test be performed. If the 24hUP quantitative test is greater than 3.5g, it indicates the presence of nephropathy, and it is recommended that further consultation and examination be conducted by the nephrology department. Fourth, if there is bleeding, urinary tract infection, etc., there will be an increase in protein content in the urine. Generally, the 24-hour quantitative examination will not exceed 1g, and may be accompanied by an increase in the number of white blood cells or red blood cells.