The urine is cloudy after being placed for a period of time, then the possible reasons: first, the patient itself suffers from urinary tract infection, there are bacteria in the urine, the urine discharged after being placed for a period of time, there can be bacterial decomposition of protein in the urine resulting in an increase in ammonia, or cause an increase in bacterial metabolites, will cause the phenomenon of cloudy urine. Second, if the outside temperature is high, urine placed for a period of time can occur corruption and deterioration, resulting in the decomposition of trace proteins in the urine and the phenomenon of cloudy urine, mostly related to external factors, the patient itself does not have infection, itself does not exist urinary tract irritation symptoms. Third, urine placed for a period of time, if too much water evaporates, there will be concentrated urine, concentrated after the urine components, such as oxalate, phosphate or urate, etc., will be supersaturated precipitation, and the formation of crystalline substances or the formation of particle-like substances, which will then be found in the appearance of the urine color is more turbid.