If you wake up in the morning with yellow urine, then most of the possible causes are caused by concentrated urine. Because during sleep at night, generally do not drink water, the majority of patients generally do not need to get up at night to urinate, so urine is stored in the bladder for about six hours or more, there will be a concentrated state, when urination will be found, the urine color is dark yellow, brownish yellow, generally not accompanied by urinary frequency, urinary urgency, painful urination. Most of them are considered to be caused by concentrated urine, and are generally not accompanied by symptoms of urinary tract irritation, and no symptoms of urinary frequency, urinary urgency, or painful urination. If you drink more water appropriately and the color of urine gradually changes to light yellow or colorless afterwards, it is a normal concentrated condition. If you continue to urinate yellow and have symptoms of urinary tract irritation and discomfort during the urinary storage period, it is recommended to go to the hospital for further examination and, if necessary, to take routine urine for laboratory tests to determine whether there is co-infection and whether there is elevated urinary bilirubin and urinary bilirubinogen.