Yellow urine with foam in the morning may be a normal physiological phenomenon, or it may be due to kidney disease. 1. Physiological phenomenon: In the morning, the body after a night of metabolism, the concentration of metabolites in the urine is higher. In addition, the amount of water intake during sleep is reduced, the urine is in a concentrated state, so the morning excretion, urine will be yellow and accompanied by foam, which is a normal physiological phenomenon. If you hold your urine for a long time, and less water intake, may also lead to this symptom, it is recommended to timely hydration, change the bad habit of holding urine, so as not to adversely affect the body. 2. Kidney disease: This is mainly due to abnormal glomerular filtration function, resulting in blood protein into the urine, so the discharge will appear foam, and not easy to dissipate. If the symptoms persist for a long time, it is recommended to go to the hospital for examination and treatment as soon as possible to avoid further deterioration of the condition. If you have yellow urine with foam in the morning, it is recommended to go to the hospital for examination and treatment under the guidance of the doctor.