Normal urine generally appears as a clear, yellowish or liquid that is produced by the kidneys and excreted through the ureter, bladder, and urethra. However, in some cases the urine will deepen in color and appear as a cloudy liquid. There are several common causes of cloudy urine at present. First, we need to consider the physiological reasons, the physiological reasons are mainly refers to, usually too little diet, a lot of sweating, long-term in a high temperature environment, resulting in the reduction of water in the body, urine concentration and the urine of salt, crystal material precipitation and presented as cloudy urine, this situation can be improved by drinking more water, dilute the urine after urination. Secondly, it is necessary to consider pathological factors, such as urinary tract infections causing pus urine, or celiac disease, as well as acute jaundice, biliary obstruction and other diseases that cause the urine to deepen in color, dark yellow or brown. Most of the urinary tract infections that cause pus urine are accompanied by symptoms such as frequent urination, urgency, and painful urination. Pathological causes of cloudy urine need to check urinary routine, liver and kidney function, ultrasound and other specific causes, and then make targeted treatment. To sum up, there are more reasons for cloudy urine, both physiological and pathological, so it is necessary to clarify the specific causes through medical history and relevant examinations, and then make the corresponding treatment if necessary.