Proteinuria is pathological, and there are functional proteinuria and pathological proteinuria. Functional proteinuria, also known as physiological proteinuria, refers to temporary proteinuria in healthy people. More common in young people. Under the influence of strenuous exercise, fever, high temperature, cold, mental stress and other factors, renal vascular spasm or congestion, resulting in increased permeability of glomerular filtration membrane, a large number of protein "escape".