Urine foam is large and broken is may be due to urine concentration, diabetes, nephritis and other factors, the specific situation should be timely to the hospital, clear cause and give targeted treatment. 1. Concentration of urine: it may be due to a lot of sweating, drinking less water to lead to the concentration of urine, which leads to urine foam is large and broken. 2. Diabetes mellitus: generally due to elevated blood sugar, which may lead to high glomerular filtration rate, resulting in increased protein filtration, and ultimately the formation of urine foam larger and broken phenomenon. 3. Nephritis: when the protein content in the urine increases, the surface tension of the urine increases, which leads to the phenomenon of larger and broken urine bubbles. Attention should be paid to avoid the environment too cold or too hot, try to avoid strenuous exercise, if there are other symptoms of discomfort, should be timely medical examination.