The yellowing of urine has been going on for a month, and the possible clinical causes include insufficient daily water intake, urinary tract infections, and liver and biliary system diseases. 1. insufficient daily water consumption: some people drink less water every day, which will cause the urine concentration, and thus the urine is darker and smells heavier. 2. urinary tract infections: this is the most common cause of yellow urine, clinically common such diseases are urinary tract infections, prostatitis, nephritis, etc., the above diseases will cause the urethra to appear broken red blood cells and other mucous membrane cells, which makes the urine deepen in color, and in serious cases will be accompanied by hematuria, proteinuria and other symptoms. 3. Hepatobiliary cell disease: some people have problems with bile discharge and stagnation, which will cause the blood bilirubin elevated, excess will make it into the urine and make the urine yellow. Symptoms can also occur when there are abnormalities in liver metabolism and problems with the conversion of bilirubin into bile. The above symptoms may also be caused by other factors, and it is recommended that people with these symptoms should go to a regular hospital for a checkup to make a clear diagnosis, so as to carry out targeted treatment and strive for a speedy recovery.