Normal urine appears pale yellow, clear and transparent. Urine is also called urine, and the color of urine itself is pale yellow in normal people, which is normal; if the color of urine deepens yellow, the cause can be determined by urine examination. The factors that cause the yellow color of urine to deepen are generally physiological factors and pathological factors. A, physiological factors normal fresh urine produced by the kidneys, through the bladder, ureter discharge, because the urine contains uric acid, water and inorganic salts, urobilinogen and other components, so in the discharge will appear light yellow, belongs to the normal phenomenon; normal people, if when sweating more, drink less water, the body is dehydrated, at this time the blood concentration, urine is also concentrated, the yellow will deepen. Second, pathological factors 1, drugs lead to: taking some drugs, such as rifampin, etc., can lead to deepening the yellow color of urine. In addition, the consumption of certain foods containing yellow pigments can also lead to yellow urine; 2, jaundice: for example, patients with liver cell damage, can appear hepatocellular jaundice, which can lead to more yellow urine. Patients with biliary obstruction, resulting in obstructive jaundice, have elevated bilirubin in the urine, which can also lead to yellow urine; hemolytic diseases, which can lead to jaundice, can also lead to yellow urine; 3, urinary tract infections: for example, patients with urethritis and cystitis can also have yellow urine due to increased bacterial metabolites or inflammatory substances, usually accompanied by frequent urination, painful urination, and pus urination. Therefore, for patients who have yellow urine on a more regular basis, it is recommended to consult a doctor to clarify the cause and then do further treatment according to the cause.