There are many reasons for yellow urine, divided into physiological reasons and pathological reasons. Physiological reasons include the following: 1, usually drink less water, urinate more, there will be a higher specific gravity of urine, so the urine will be yellow. 2, oral consumption of certain foods, such as carrots, pineapple, will also appear to urinate yellow. 3, oral consumption of certain medications, such as B vitamins, will also urinate yellow. 4, oral consumption of certain medications, such as B vitamins, will also urinate yellow. 5, oral consumption of certain medications, such as B vitamins, will also urinate yellow. 6, oral consumption of certain medications, such as B vitamins, will also urinate yellow. Pathological causes include: 1, the emergence of urinary tract infections, especially caused by E. coli urinary tract infections, there will be yellow urine. 2, due to certain diseases leading to biliary obstruction or liver disease leading to elevated aminotransferases, there will also be yellow urine.