If white flocculent material appears in urine, the possible causes are: 1. If infection occurs in the urinary tract, the urine containing bacteria and metabolites will be cloudy and accompanied by white flocculent material. It is also accompanied by symptoms such as frequent urination, urinary urgency, painful urination, back pain and abdominal pain. It is necessary to further check the urine routine and culture to determine the infection and need anti-infection treatment.2. If you have urinary stones, and then after extracorporeal shock wave lithotripsy treatment, you can also see cloudy flocculent or crystalline material in the urine, consider the discharge of small stones after lithotripsy. After the stone is completely removed, the flocculent precipitate in the urine can disappear completely.3. If a patient has had indwelling catheterization, cloudy urine may also occur. Due to the long-term wearing of catheters or catheterization operations, resulting in the local concentration of fluid or condensation in the urethra to form a white flocculent precipitate, etc., there may be no urinary tract infection symptoms such as frequent and urgent urination. It is only necessary to drink more water and urinate more often, and after the catheter is removed, its urine can return to a normal state.