Urine has a smell, it may be a normal physiological situation, but also may be the cause of urinary tract infection or suffering from diabetes. 1. Normal physiological situation: under normal circumstances, urine contains a certain odor of ammonia. 2. Urinary tract infection: when the patient suffers from urinary tract infection, because the urine contains bacteria and their products, this situation will lead to ammonia odor aggravation. 3. Diabetes: When patients suffer from diabetes, severe ketoacidosis may result, in which case the urine will have a rotten apple flavor. The smell of urine may also be caused by other factors. In general, urine contains a certain flavor, but if the taste of urine inside the heavier or accompanied by hematuria and other abnormalities, it is recommended to go to the regular hospital as soon as possible, seek medical help.