Urine out of the urine is very yellow for two reasons: First, due to the human body intake of water is too little or a lot of sweat in summer, the body’s lack of water leads to the concentration of urine will be discharged urine is very yellow, or in the morning the first time to urinate, due to the whole night’s sleep produces waste material will be concentrated in the urine, there is also a concentration of urine, so the above situation will lead to urine is very yellow, it is normal! The physiological phenomenon, intake of water after the urine will return to normal color. Secondly, if the human body’s liver and gallbladder are damaged will also cause yellow urine, hepatitis, cholecystitis will lead to an increase in bilirubin in the body, bilirubin will be formed under the action of intestinal bacteria urobilinogen, a large number of urobilinogen will be discharged out of the body along with the body’s urine, resulting in the symptoms of yellow urine.