Bad breath is a reasonably common symptom that may be the simple result of poor dental hygiene. However, different types of breath odor can also indicate certain types of serious medical conditions. For example, a “fruity breath odor” is one of the characteristic symptoms of diabetic ketoacidosis, which can be fatal within hours or days. Another example is a “fecal breath odor” which can indicate certain types of intestinal blockage. Have any breath odor symptoms examined promptly by a medical professional.

» Review Causes of Breath odor: full list

Causes of Breath odor:

The following medical conditions are some of the possible causes of Breath odor. There are likely to be other possible causes, so ask your doctor about your symptoms.

• Practical reasons for bad breath odor include:
  • Certain foods
  • Alcohol
  • Smoking
  • Psychogenic halitosis – anxiety about halitosis often without actually having it.
• Halitosis
• Dental conditions
  • Poor dental hygiene
  • Dental disorders
  • Tooth decay
  • Dental plaque
  • Tooth abscess
  • Tooth infections (type of Dental conditions)
  • Gingivitis
  • Gum disease
  • Periodontitis
  • Dentures

  Original Source: http://www.wrongdiagnosis.com/sym/breath_odor.htm