Bubbles in urine can be seen in several situations: first, it may be normal, because the body in cold, high heat, exercise, high protein diet, the kidneys will excrete a small amount of protein, so there will be protein in the urine, so that the urine indicates an increase in tension caused by the formation of bubbles. Secondly, it is seen in nephrotic syndrome and nephritis, which will cause damage to the basement membrane of the glomerulus, and a large amount of protein will overflow from the glomerulus into the renal tubules, which cannot reabsorb the protein, and the urine contains a large amount of protein to form bubble urine. Again, common in diabetes mellitus, because the urine can contain a large amount of glucose, causing an increase in the composition of organic acids in the urine will form bubble urine. It is common in infectious diseases of the urinary system, such as pyelonephritis and cystitis, etc. Due to the action of bacteria, the organic components in the urine will be fermented and processed by bacteria to volatilize into urinary amines, and the urine will show bubble-like changes.