The urine is very yellow these days, possible causes: a. Concentrated urine, such as the recent hot weather, more water evaporates through the body surface or less water is drunk, may lead to concentrated urine. This can occur when the urine is yellow and will not be accompanied by any discomfort in urination, no frequency, urgency, painful urination, etc. After drinking more water and urinating more, the color of urine can return to normal, which is a physiological concentration phenomenon. Second, if there are liver diseases or biliary tract diseases, it can lead to an increase in the level of bilirubin in the body, and then the level of conjugated bilirubin discharged through the urine increases, which can be manifested as yellow urine. Liver function tests or ultrasound examinations of the liver and biliary tract are needed to further confirm the existence of related diseases. Third, if there is an infection in the urinary tract, yellow urine can appear. It is accompanied by symptoms such as frequent urination, urgent urination, painful urination, or cloudy urine. Routine urine and urine culture tests should be performed to further confirm the presence of infection.