Foam in the urine. What's going on?

There is foam in the urine, which may be caused by physiological factors or by certain diseases, as follows: First, if there is too little enterprise loss in daily drinking water, urine will show concentrated state, the urine discharged will be foam urine, physiological foam urine normal duration is not long, will automatically disappear within half an hour, second, if foam urine exists for a long time, may be caused by excessive protein content in urine, mainly caused by kidney diseases, such as chronic nephritis, glomerulonephritis, etc., patients should do further 24-hour protein quantitative detection and renal function examination.