If urine becomes highly concentrated — a high level of waste products with little water — your urine may have a strong ammonia odor.
Other symptoms and signs associated with smelly urine include cloudy urine, blood including bladder infections, affect women and men, causing UTI symptoms like kidney infection. How much urine does the average adult pass each day?.
NHS Choices information on smelly urine, with links to other useful resources.
Urine naturally has an odor that's unique to everyone. It's usually not a strong odor, but you may notice that your urine occasionally smells.
Urine doesn't usually have a strong smell. But some foods -- especially asparagus, which has a smelly sulfur compound -- can change the odor. So can vitamin.