Normal urine odor from the volatile acid in urine. Urine to place too long may arise as a result of urea and ammonia decomposition foul odor. [Clinical significance]: When the smell of fresh urine when the discharge of ammonia smell of urine, there may be as chronic cystitis, or urinary retention caused by chronic. Diabetic ketoacidosis, the smell of urine was available Ping Guowei. A large number of eating garlic, onions, and other special smell of food and vegetables, the special smell of urine can occur. http://health- pain.blogspot.com/2008/12/urine-odor.html