Possible causes of white cloudy urine during urination: 1. When urinary tract infection occurs, cloudy urine can occur, accompanied by symptoms such as frequent urination, urinary urgency and painful urination. Because urine contains many bacterial metabolites, such as white blood cells and pus cells, it appears white and cloudy. The diagnosis needs to be confirmed by urine routine or urine culture. 2. salt urine or crystalluria, white cloudy or crystalline material can appear in the urine, usually without any urinary tract irritation symptoms. It is likely to occur in cold weather and in children. This is a condition in which some components of the urine are over-saturated and form crystals, and it requires drinking more water and urinating more often. Patients may also have features such as lymphangitis or edema. Blood or urine tests are needed to look for young filarial worms to confirm the diagnosis.