The possible causes of green urine: 1, there is a Pseudomonas aeruginosa infection, when the urine can appear green, usually accompanied by frequent urination, urinary urgency, painful urination symptoms, serious patients can even be accompanied by back pain or fever symptoms. It is recommended that a urine culture test be performed, and if Pseudomonas aeruginosa is cultured, the diagnosis can be confirmed and active anti-infection treatment needs to be given. 2. If a large number of vitamins are taken orally or a large number of oral anti-infective drugs, such as sulfonamides and furans, can lead to green urine, the symptoms of green urine will disappear after the intake of the relevant drugs is stopped. This is a normal drug metabolic reaction, not a disease condition. 3, if there are patients with abnormal serum bilirubin, such as various types of viral hepatitis or with biliary obstruction, bile duct stones, etc., can appear green urine. The bilirubin in the urine in this case is relatively high, and if the urine is stored in the bladder for a long time without being excreted, the bilirubin may oxidize to bilirubin, and a greenish urine color will occur.