If there are white cloudy substances in urine, then the possible causes are: first, the increase of crystalline components in urine, when there is an increase of oxalic acid, uric acid or phosphoric acid and other components, there can be white crystalline substances precipitated in urine, then the urine is cloudy, and after the urine is left to settle, the phenomenon of stratification of urine can occur. And heating the relevant crystals, the crystals can disappear quickly, without any urinary irritation, such as urinary frequency, urinary urgency, painful urination, etc., can be further identified by routine urine examination. Second, urinary tract infections, such as kidney abscess, pyelonephritis, cystitis, etc. can appear cloudy white urine, floating flocculent or feathery precipitate, mostly pus or shed epithelial tissue, accompanied by urinary frequency, urinary urgency, painful urination, need to carry out routine urine examination and urine culture examination to further identify. Thirdly, if patients who have had urinary stones can discharge white cloudy material for a short time after extracorporeal shock wave lithotripsy or drug discharge, mostly discharge fine stones.