If the urine is cloudy, yellow and smells bad, it is recommended to go to the hospital for further examination to clarify the specific cause. Possible causes: First, urinary tract infection, when a bacterial infection occurs, there can be a large number of bacteria or pus cells in the urine, which can lead to cloudy urine and a deepening of the urine color. At the same time, because it contains more pus cells, it produces a heavy odor when urinating, accompanied by urinary tract irritation symptoms, such as urinary frequency, urinary urgency, painful urination, etc. It is necessary to retain urine for routine urine examination and urine culture test to further confirm the diagnosis. Second, when metabolic diseases occur in the body, such as jaundice diseases. When patients have diabetic ketoacidosis, the urine contains a large amount of ketone bodies, which can also show yellow urine, accompanied by odor, as well as unclear urine, cloudy urine, etc. It is necessary to further perform systemic liver and kidney function tests and blood glucose tests, and to retain urine for routine urine tests and urine culture tests to exclude.