The yellow urine may be caused by physiological factors, or it may be caused by urinary tract infection, nephrotic syndrome and other pathological factors. 1. Physiological factors: when the intake of water is too little or sweating and other factors lead to water loss is more serious, there may be urine concentration, resulting in the phenomenon of yellow urine, this is a physiological phenomenon, moderate drinking water can be better. 2. Urinary tract infection: when there is frequent urination, urinary urgency, urinary incontinence, consider the possibility of urinary tract infection. At this time, you can also have the symptom of yellow urine. 3. Nephrotic syndrome: this kind of disease will lead to more protein in the urine, which will cause the phenomenon of yellow urine. There are other reasons for yellow urine, so it is recommended to consult a doctor in time to find out the reason and treat the cause.