Positive urine protein on physical examination can be divided into two types: physiological proteinuria and pathological proteinuria. Physiological proteinuria is commonly seen after strenuous exercise, fever or mental stress, as well as proteinuria caused by sudden uprightness, which does not require special treatment and can disappear on its own after a period of time. Pathological proteinuria is often caused by kidney disease or other systemic secondary kidney disease, and requires examination at a hospital, including urinary routine, 24h urine protein quantification, immunological tests and related indicators such as blood sugar and hepatitis, to clarify the specific cause. For patients with 24h urine protein quantification greater than 1g, kidney puncture is recommended to clarify the pathological type and cause and guide the next step of treatment.