The cloudy yellow urine may be a physiological phenomenon caused by drinking too little water, or it may be caused by cystitis, pyelonephritis, renal tuberculosis and other diseases. 1. Physiological phenomenon: usually patients usually poor eating habits, drinking too little water, often appear cloudy yellow urine, is a normal physiological phenomenon. 2. Cystitis: usually due to bacterial infection, but also with drugs, radiation therapy, foreign bodies, chemical substances and other factors. Generally acute cystitis patients often appear urinary frequency, urinary urgency, urinary pain and other symptoms, and in severe cases can appear similar to the situation of urinary incontinence. Some patients may also show that the urine is dark in color, turbid in texture, and has an obvious abnormal smell, which may also appear as cloudy yellow urine. 3. Pyelonephritis: usually due to bacterial infection, and also related to urinary tract obstruction, pregnancy, urinary system structural abnormalities and other factors. Usually patients will have fever, chills, urinary frequency, urinary urgency and other symptoms, some patients may also be accompanied by nausea, vomiting and other gastrointestinal symptoms. Some patients may have hematuria and pyuria, which may be manifested as cloudy yellow urine. 4. Kidney tuberculosis: the pathogen of this disease mainly comes from pulmonary tuberculosis, but also may come from osteoarticular tuberculosis, intestinal tuberculosis, etc., and also with their own malnutrition, poor hygiene of the living environment, immunity decline and other factors. Patients often appear urinary urgency, urinary pain and other symptoms, and some patients can also be accompanied by hematuria, pus, lumbar pain and lumps and other phenomena, can also be manifested as cloudy yellow urine. There may be other reasons for cloudy yellow urine, and it is recommended to consult a doctor in time.