The urine is yellow and has a peculiar smell. The possible reasons are: first, the urine is yellow when it is extremely concentrated, and the urine discharged has a certain peculiar smell. This is because less water or more sweat, or dehydration and other conditions can lead to concentrated urine, which is characterized by yellowing and odor. Generally, it is not accompanied by any pain, frequency of urination, urgency of urination, etc., and can recover to normal after proper drinking or fluid replacement. Second, when there is urinary tract infection, there may be yellow urine color accompanied by turbid urine, accompanied by urine odor, and at the same time, there may be frequency of urination, urgency of urination, pain in urination, and other symptoms. Routine urine examination and urine culture examination are required to further identify and diagnose. Third, when there is a history of liver or biliary system diseases, the level of bilirubin in blood can rise. At this time, the level of bilirubin in the urine can also be increased, and the urine is yellow and accompanied by a certain odor. It is necessary to carry out liver and bile duct related function tests to further identify.