What causes yellow urine in the morning

Morning urine color is very yellow what reason is that? Morning urine is very yellow, the main reason is not enough water, nocturnal urine in a concentrated state, morning urine found that urine will be very yellow, it is recommended to test urine routine, if urine routine is normal, that is, water is not enough, you can drink a cup of water before bed, can drink water at night, can effectively dilute urine, effectively make urine clear yellow, if the test urine routine prompts urine bilirubin positive, to consider hepatobiliary system diseases, it is recommended to test liver function, Liver and gallbladder color Doppler ultrasound and hepatitis marker examination to determine in the end is obstructive jaundice or jaundice caused by hepatitis yellow urine, and then decide how to treat the next step.