The yellowish color of urine may be caused by physiological factors, urinary tract infections, liver diseases and other factors. 1. Physiological factors: such as drinking too little water caused by the concentration of urine, food factors, etc., may lead to yellow urine color, should increase the amount of water, and improve the diet, the color of urine can be restored to normal, generally does not cause adverse effects. 2. urinary tract infections: for example, cystitis or urethritis, can make the urine in the presence of purulent secretions, white blood cells, red blood cells and other substances, will lead to yellow urine, may also be accompanied by frequent urination, urinary urgency, urinary pain and other symptoms. 3. Liver disease: For example, cholestatic jaundice or hepatocellular jaundice may lead to bilirubin metabolism disorders, which may cause yellow urine and yellowing of the skin. If the urine is yellow and there are other abnormalities, it is recommended to seek medical examination and treatment to avoid adverse effects.