If the urine is light green, it is recommended to go to the hospital for further examination to clarify the cause. First, after taking a large amount of antibiotics, the light green color can appear for a short period of time. Patients may not have any conscious symptoms, after stopping a large number of antibiotics, the situation of light green urine can be improved naturally; second, if combined with Pseudomonas aeruginosa infection, it can cause light green urine, or cause the phenomenon of cloudy urine. This is usually accompanied by symptoms of frequent urination, urinary urgency, and painful urination, and further urine culture examination is needed to clarify whether there is Pseudomonas aeruginosa infection; third, when there is an elevated level of bilirubin in the urine, there may be a light green urine, which is often seen when the urine is left for a period of time, and the bilirubin in the urine is oxidized and bilirubin is formed, so it can be shown as a light green urine. The change can be seen as a light green urine. Fourthly, after using some special drugs, such as intravenous infusion of melphalan injection or methylene blue, changes such as light green or light purple urine may occur within a short period of time.