Foamy urine occurs after urinary tract infection, because after urinary tract infection, the number of leukocytes in the urine will increase, and will be mixed with bacteria and their metabolites, at the same time, can be accompanied by an increase in the content of micro-protein, the concentration of solutes in the urine will be increased, and in the process of urination and the shock of the water can produce a lot of foam. It is usually accompanied by frequent urination, urinary urgency or cloudy urination, and can be accompanied by pain in the urethra during urination. When anti-infective treatment, the number of white blood cells in the urine, the number of bacteria and their protein content is reduced, the specific gravity and concentration of urine will decrease, and the foam during urination will gradually decrease or disappear. It should be further identified with proteinuria or diabetes mellitus, etc. It is recommended to go to the hospital for urine routine, urine culture, urine sugar, blood sugar and other related measurements, to clarify whether the foamy urine is related to the infection or not, and more foam will also appear in the infected state, but usually there are symptoms of urinary tract irritation.