Dehydrated or UTI. Foods (asparagus) can do it. If you get dehydrated, your body concentrates your urine to preserve water. This can make it smell strong. Drinking more water will reverse it. A urinary tract infection (UTI) can also change the odor. You may also have burning or pain, frequent urges, fever, or back pain with a uti. If drinking more doesn't help and you have any of these symptoms, get urine checked.