Urine microalbumin 25mg/L is not normal. Normal human daily urine microalbumin is generally less than 20mg/L, urine microalbumin usually suggests early kidney disease, elevated urine microalbumin is generally associated with renal injury and urological diseases, but also can be seen in physiological conditions such as strenuous exercise and so on. 1. Kidney injury: such as primary glomerular disease, diabetic nephropathy, hypertensive nephropathy and so on lead to glomerular or tubular injury, resulting in elevated urine microalbumin. 2. Urologic diseases: if there is cystitis, prostatitis and other urinary tract inflammation, it may also lead to elevated urine microalbumin. 3. Physiological factors: strenuous exercise, eating a lot of high-protein food, etc., can also lead to elevated urine microalbumin. Therefore, when the urine microalbumin is elevated, it is recommended to consult a regular hospital in a timely manner, improve the relevant examination, identify the causes, and follow the doctor’s instructions for standardized treatment.