A small amount of tiny bubbles floating on top of the urine may be caused by low water intake, diabetes, glomerulonephritis and other reasons. 1. Drinking less water: Drinking less water will lead to the concentration of urine, there will be a small amount of tiny bubbles floating above the urine, but usually quickly dissipate. 2. Diabetes mellitus: a group of metabolic diseases characterized by chronic hyperglycemia caused by a variety of etiological factors, there will be polyuria, polydipsia, polyphagia and weight loss, which may be accompanied by itching of the skin, due to the high content of glucose in the urine, there will be a small amount of tiny bubbles floating on top of the urine phenomenon. 3. Glomerulonephritis: This is a disease in which the glomerular filtration function is impaired due to infection, disease, autoimmunity and other reasons, resulting in hematuria, proteinuria, edema, hypertension as the main manifestation of the disease, which leads to an increase in urinary protein, and small dense bubbles appear in the urine, which are generally not easy to dissipate. A small amount of tiny foam floating above the urine may also be seen in urinary tract infections, celiac disease and other diseases. If there is a small amount of tiny foam floating above the urine symptoms, persistent unrelieved, need to timely regular hospital medical treatment.