Foamy urine and does not dissipate for a long time is commonly associated with kidney damage such as nephrotic syndrome and diabetes, and should be identified. Foamy urine and does not go away for a long time suggests that there is too much urine protein inside the urine, and the kidney function is damaged by elevated urine protein for a long time. Under normal circumstances, human urine does not contain protein or contains only a small amount of protein, but when the kidneys are diseased, the flow of protein with the blood circulation through the kidneys, because the kidney filtration function is reduced and the protein “leak”. The foam in the urine and does not dissipate for a long time, may be seen in the following situations: 1, diabetes, patients with high urine sugar, ketone body content, resulting in a decrease in urine tension, there is foam in the urine and does not dissipate for a long time. 2, liver and kidney disease, such as purpura nephritis, hepatitis B virus-related nephritis, patients with elevated bilirubin, urine protein and other indicators in the urine, will also lead to a decrease in urine tension. 3. Urinary tract infections, such as cystitis, urethritis, prostatitis, etc., can also lead to a decrease in urine tension. 4. It is possible that the urine is mixed with semen, prostate fluid, etc. If the foam in urine does not dissipate for a long time, it is recommended to go to the urology department or nephrology department of a regular hospital in time for routine urine and urine protein quantification tests to clarify the diagnosis.