Urination is a process that we do at least 10 times a day on average and most of the time, it is a secondary thought. When you start to notice changes in the color and the smell of your urine, however, it can become a stressful situation due to the sensitive anatomy involved and the number of possibilities that could be causing these changes.
Numerous things can cause urine to have a smoky odor and just because there is a noticeable scent, that does not mean that you have an underlying pathology. One of the first reasons that you may have a foul-smelling urine stream would be only due to the concentration of electrolytes in the urine. When you are dehydrated, the levels of electrolytes and ammonia in your urine are slightly higher than normal, but the amount of water that would typically dilute this electrolyte mixture is much lower than average as your body is trying to conserve the necessary amounts of water.
Intensive exercise, insufficient water intake or a combination of both of these are some of the most common causes of this type of concentrated ammonia secretion. The best way to avoid this is to make sure you drink at least 2 liters of water per day and increase your intake in you plan to do some exercise throughout the day.
Foods are another cause of changes in your urine scent, and this is something that is nothing to worry about. When it comes to your diet, foods like asparagus and numerous vitamin supplements that are commonly taken can inadvertently lead to smelly urine, which is nothing to worry about and the scent will gradually resolve after the cessation of these substances.
Now that we have gone over what are innocent reasons to have foul-smelling urine, we soon will come to some more problematic causes of foul-smelling urine. If you cannot pinpoint one of these two reasons for foul-smelling urine that are from innocent origins, it is a good idea to go to your urologist because you may be suffering from an underlying medical condition that could be causing your peculiar urinary odor.
Bladder infections like urinary tract infections or cystitis are two potential causes of producing an aroma in your urine. Bacteria naturally gives off an odor as it grows and ferments so changes in the smell of your urine could indicate that there may be an infection brewing in your bladder. You may not necessarily have the same increased urinary frequency and burning that is commonly associated with a UTI so be aware that a bacterial infection is still a likely source of odor even if you do not have the typical symptoms. 
Kidney infections like glomerulonephritis could also be a cause of changes in the odor of urine. Urine will typically be a dark black or smoky color in nature and may also have a foul-smelling odor associated with it. Patients who had a recent cold or infection are likely to suffer from this type of condition.
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