Normal foam in urine usually disappears within 5 to 30 minutes. If the foam in the urine is delicate and does not disappear for a long time, it may be caused by disease factors. 1. Urinate too quickly or urinate in a high position, will make the urine in the impact of the role of the air mixed with the formation of foam, caused by the foam is generally larger, and quickly dissipate, this situation is relatively normal, without special treatment. 2. Increased protein in the urine can lead to the emergence of a large amount of foam that is not easy to dissipate. Physiological conditions, strenuous exercise, nervousness, cold and other factors may cause an increase in the proportion of protein in the urine. When the patient has kidney disease, such as glomerulonephritis, nephrotic syndrome, etc., the impaired kidney function makes protein leakage into the urine, all of which will increase the protein in the urine. When there are bubbles in urine and the cause cannot be determined, patients are advised to go to the hospital in time to clarify the cause of the disease and then be treated under the guidance of the doctor.