Sometimes urine can give off a very strong smell, and some people often seek medical attention for the smell of urine. What should I look for in these special smells? 1, the smell of ammonia, the normal urine within the volatile acid placed due to bacterial decomposition of urea appears ammonia smell. If the smell of ammonia appears in fresh urine, it often suggests chronic urinary retention. 2, foul smell, which is a signal of bacterial infection, mostly infection of colonic bacteria. 3, fruity smell, pay attention to diabetic ketoacidosis, prompting a blood glucose and blood ketone body check. With the above problems, routine urine tests, as well as blood biochemical tests are needed to rule out certain diseases.