Possible causes if there is a white precipitate in the urine: 1. Salt urine or crystalline urine. This is often due to the concentrated state of urine when the urine is over-saturated with components, under the action of certain triggers, white crystals or precipitates can be formed. It is more likely to occur in cold weather, such as when the outside ambient temperature is low, and the urine that comes out can appear to have white urine or be accompanied by white precipitates. This condition is not accompanied by pain or any discomfort in urination and can be improved by drinking more water. This is due to the fact that the saturation point of solute concentration in urine decreases when the ambient temperature decreases, so the urine is instantly crystallized and appears white or with white precipitation. 2. Urinary stones. If after treatment such as extracorporeal shock wave lithotripsy or drug lithotripsy, small stones can be discharged intermittently, which can be manifested as white precipitation or precipitation of other colors, such as brownish-yellow precipitation, etc.