Urine odor is big consider two causes: first, urinary tract infection; second, chronic kidney failure. The first is urinary tract infection, urinary tract infection is caused by bacterial infection of the urinary tract. Bacterial infection of the urinary tract after the fermentation in the urinary tract, will produce an unpleasant smell, the smell of urine will be very big. For this disease do not worry too much, after antibiotic anti-infection treatment most can be cured. If you want to confirm the diagnosis, it is recommended to perform routine urine and urine culture tests. Next is chronic renal failure, which is caused by a decrease in glomerular filtration rate due to chronic kidney disease. When the glomerular filtration rate is reduced, toxins in the blood will be increased, among which urea nitrogen is representative. At the same time, the concentration of urea nitrogen in the urine will also be elevated, which will cause the urine to produce a very strong odor, very much like the smell of fertilizer, and smell very choking to the nose. This is a more serious disease, and to confirm the diagnosis, a kidney function test is recommended.