Possible causes of green urine: First, after taking a large amount of antibacterial agents, or after taking a higher amount of vitamin B, a light green or yellow-green urine may appear. Second, if there is Pseudomonas aeruginosa infection in the urine, a greenish urine color may appear along with symptoms such as frequent urination, urgency and painful urination. A clean middle urine culture is needed, and a culture of Pseudomonas aeruginosa can confirm the diagnosis. Third, if the urine contains more bilirubin, this can occur when the urine turns green. When there is more bilirubin in the urine and the urine is stored in the bladder for more than two hours, the oxidation of bilirubin to bilirubin can occur, or when the urine is left for a period of time after discharge, the light green color of the urine can occur, also because of the oxidation of bilirubin to bilirubin in the urine. Therefore, if a routine urine examination is performed and an elevated level of bilirubin in the urine is seen, and if it is accompanied by an elevated level of serum bilirubin, the urine may appear pale green.