Urine yellow with foam can not be considered a precursor of uremia, it may also be caused by physiological factors such as drinking too little water, diabetes and other diseases. 1. Uremia precursor: chronic kidney disease patients in the intake of large amounts of water, due to the decline in glomerular filtration rate leading to a reduction in the production of primary urine, urine concentration, the phenomenon of yellow urine, and renal basement membrane damage, resulting in elevated protein in the urine, the urine surface tension decreases, the phenomenon of foam in the urine will occur. 2. Physiological factors: under normal circumstances, the urine itself is a clear yellowish color, there may be a small amount of foam, but in the morning urine, hold urine for a long time, as well as drinking too little water, sweating too much will lead to the concentration of urine, which may cause the yellow color of urine, the phenomenon of increased foam in the urine. 3. diabetes: diabetic patients due to poor blood sugar control, resulting in increased urinary sugar, there will also be a decrease in the surface tension of the urine, the symptoms of yellow urine with foam. Urine yellow foam may also have other reasons, it is recommended that patients go to the regular hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.