The possible reasons for the recent yellow urine: 1, urine concentration, such as hot weather leading to increased sweating or reduced water consumption, or suffering from vomiting, diarrhea and other diseases leading to excessive water loss in the body, can lead to a concentrated state of urine, which can be manifested as yellow urine, but will not be accompanied by any abnormal urination, will not appear frequent urination, urinary urgency, painful urination. If there is liver or biliary tract disease, the bilirubin level in the serum may increase, such as hepatocellular jaundice or obstructive jaundice caused by biliary stones or biliary tract tumors, and the combined bilirubin level discharged through the urine may be yellow. It is recommended that routine urinalysis, liver function tests and ultrasound examinations of the liver and biliary tract be performed to rule out yellow urine caused by the above-mentioned diseases. 3. Oral administration of some drugs can cause yellow urine, such as oral administration of vitamin B complex or 21 gold vitamins or sulfonamide antibiotics or furan antibiotics, etc. can cause yellow urine. After stopping the relevant medication, the urine color can be restored to a normal color.