Sometimes the urine appears cloudy, possible causes: i. If there is a high fat and protein diet, there may be a transient cloudy urine, where the protein content in the urine increases and manifests itself as a cloudy phenomenon. This condition is not accompanied by symptoms of urinary tract irritation such as frequent urination, urinary urgency and painful urination. After a reasonable diet, the phenomenon of cloudy urine can disappear by itself; secondly, when suffering from urinary tract infection, cloudy urine can appear, which is mostly accompanied by urinary tract irritation symptoms, combined with discomfort such as urinary frequency, urinary urgency, painful urination or lumbago, and can appear increased sediment in the urine. Anti-infection treatment is needed, and the infection can be restored to normal only after eradication; third, salt urine, such as less water or increased certain components in the urine, such as oxalic acid and uric acid, can cause the formation of related crystalline substances, which can be manifested as cloudy urine. Especially in the cold winter months, the phenomenon of cloudiness can easily appear when the temperature is low, without any symptoms of urinary tract irritation, and requires routine urine examination to determine the presence of crystalline urine and proper drinking of more water before it can return to normal.