What is the cause of produce the urine protein?

What is the cause of produce the urine protein? There is two reasons:

Physiological reason: Work on the heavy physical labour, or the strenuous exercise, or the mood of the big fluctuations, or ate the pungent food, there reasons will produce the urine protein, but these urine proteins usually disappear soon.

Pathological reason: The kidney damage will give rise to the leakage of proteins. There are two kinds of damage:

The one is glomerulus damage: Glomerular filtration barrier is destroyed, resulting in a large number of protein filtration. Renal tubules cannot be absorbed in time, let the protein leakage into the urine.

The two is kidney tubules damage: Renal tubules are destroyed, resulting in decreased ability to reabsorbate, so that the protein leaks into the urine.