Foam in urine is not necessarily a disease, but can be initially judged based on the accompanying symptoms, and the diagnosis must be confirmed with the appropriate examination. Since urine is a metabolic product of the body, a large amount of organic substances and inorganic salts, etc. will be discharged from the body during urination, making the urine more tense, resulting in foam of varying sizes. If there are no other uncomfortable symptoms, it is generally normal and does not require special treatment. If the foam does not subside for a long time, accompanied by symptoms such as soreness and weakness of the lower back, easy fatigue, edema of the eyelids or lower limbs, it may be caused by kidney diseases such as glomerulonephritis and nephrotic syndrome. If there is thirst and excessive drinking, polyuria, unexplained increase in meal quantity and weight loss, it may be caused by diabetes. If certain diseases are suspected, you can go to the department of nephrology or urology for routine urine examination, or go to the department of endocrinology or general internal medicine for fasting glucose testing to clarify the cause and then treat the symptoms.