Frothy urine is not necessarily inflammatory. Foamy urine can occur in pathological conditions such as liver disease, kidney disease, bladder disease, diabetes mellitus, urinary tract infections, or in normal physiological conditions. 1. Liver disease: In liver disease, urine bilirubin content increases, urine surface tension decreases, and bubbles appear in the urine. 2. Kidney disease: all kinds of kidney disease leads to kidney damage, urine protein content increases, will make the urine surface tension decreases, bubbles appear in the urine. 3. Diabetes mellitus: diabetic patients with elevated levels of urine glucose or urine ketone bodies in the urine, the urine of organic matter (glucose) and inorganic substances increase, can also make urine bubbles. 4. Urinary tract infections: the presence of gas-producing bacteria in the urinary system, the urine can produce bubbles. 5. Bladder diseases: cystitis, bladder cancer or other urinary tract infections and other diseases, can make the composition of the urine changes, the urine bubbles. 6. Other diseases: poems syndrome can also be seen foamy urine. 7. Normal physiology: functional proteinuria can be seen in the occurrence of strenuous exercise, fever or cold, postural proteinuria can be seen in adolescents and young people, upright spinal scoliosis caused by proteinuria disappears after lying down. Urinary urgency, urination, stand too high, urine concentration can also be seen when the foam urine. Foamy urine alone can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended to clarify the cause of the disease under the guidance of a doctor.