When white foam appears in urine, it is recommended to drink more water appropriately and to perform routine urine examination. Possible reasons for the appearance of white foam: 1. The concentration of solutes in the urine is too high, and if there is proteinuria, there may be an increase in foam in the urine during urination. It is recommended to perform a routine urine examination to find out whether there is urinary protein, and if there is no urinary protein, drink more water and observe whether the urinary foam has improved. 2. When the concentration of certain solutes is too high, there can also be more urinary foam. For example, in patients with diabetes, a higher concentration of blood glucose or a higher concentration of ketone bodies can be seen as foam during urination. If a patient has diabetes, it is recommended to check urine sugar, and if there is excessive urine sugar, it is recommended to actively control blood sugar treatment.3. For patients with abnormal bilirubin metabolism in the urine, or with urinary tract infections, there can also be more foam during urination. This is because the urine contains more pus cells and there is abnormal bilirubin metabolism in the urine. In this case, the urination process produces more foam due to the high concentration of solutes and the shock of urine with water. If there is an elevated bilirubin level in the urine test or an elevated white blood cell count, further liver function tests or anti-infection treatment are recommended.