The possible causes of yellow urine are as follows: 1. Concentrated urine, such as drinking less water, holding urine for a long time, can lead to yellow urine, usually not accompanied by urinary frequency, urinary urgency, painful urination and other symptoms. 2. Drugs or food staining, such as the use of a large number of antibiotics or vitamin B, etc., can lead to yellow urine. The color of urine can return to normal after stopping the intake of related drugs, usually without any urinary tract irritation symptoms. 3, the presence of infection in the urinary tract, can appear yellow, cloudy urine, mostly accompanied by frequent urination, urinary urgency, painful urination and other symptoms, the need for routine urine and urine culture test to further exclude the presence of infection. 4, suffering from jaundice diseases, such as hepatocellular jaundice or obstructive jaundice due to biliary obstruction, can lead to yellow urine. Both will lead to yellow urine, and may be accompanied by abnormal liver function, abdominal pain or yellow staining of the skin and sclera.