Bad breath; Halitosis
Breath odor is the scent of the air you breathe out of your mouth. Unpleasant, distinctive, or offensive breath odor is commonly called bad breath.
Some disorders will produce specific, characteristic odors to the breath.
Bad breath related to poor oral hygiene is most common and caused by release of sulphur compounds by bacteria in the mouth.
A fruity odor to the breath occurs as the body attempts to get rid of excess acetone through the breathing. This is a sign of ketoacidosis, which may occur in diabetes. It is a potentially life-threatening condition.
Breath that smells like feces can occur with prolonged vomiting, especially when there is a bowel obstruction. It may also occur temporarily if a person has a tube placed through the nose or mouth to the stomach to drain the stomach contents (nasogastric tube) in place.
The breath may have an ammonia-like odor (also described as urine-like or "fishy") in people with chronic kidney failure.
If previously normal breath turns into halitosis, causes could include:
Diseases that may be associated with breath odor (not presented in order of likelihood -- some are extremely unlikely):
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