Foamy urine is not necessarily caused by kidney disease, because urine contains many metabolic wastes of the body, like creatinine, urea, uric acid and some trace proteins, which can change the surface tension of urine, and foam in urine will appear. Patients can check the urine routine to know whether they have kidney disease initially. If there is positive urine protein and occult blood, it suggests that there are kidney problems. Common causes include nephritis, nephrotic syndrome, diabetic nephropathy and so on, which need to be treated according to the specific condition and cause to develop a treatment plan. Kidney disease is relatively common in clinical practice, with a prevalence of about 10.8% in the total population. In the early stage of kidney disease, the deterioration of the disease can be effectively avoided through active treatment.