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Can stomach problems be causing my bad breath?

I feel like my breath is always bad. My mouth just tastes funny and I eat mints and gum all the time. I have some stomach issues, like an ulcer and indigestion. Is this causing my bad breath?
Bad breath, medically referred as halitosis, is brought on by excessive bacterial activity on the tongue in most cases (85%-90%), and gum disease which produces high levels of foul odors mainly due to the breakdown of proteins into individual amino acids, followed by further breakdown of certain amino acids to produce sulfur compounds. The stomach is considered by most experts to be a very uncommon source of bad breath. It is because the esophagus is closed, and a reflux serious enough to be bringing up stomach contents between the stomach and the esophagus indicates a health problem (i.e., gastroesophageal reflux disease or GERD). That said, only an extremely small percentage of bad breath problems may arise from stomach and digestion problems. Since halitosis is almost always caused by a problem in the mouth, home remedies used against bad breath, such as mints and gum, may only temporarily mask the odors but cannot cure your bad breath. Eliminating the source of halitosis is an effective solution. I recommend that you visit a dentist first. If no oral cause of your bad breath can be identified by the dentist, I suggest an appointment with a primary care doctor or gastroenterologist (GI) to be evaluated for underlying reason for the potential stomach problem or any other condition that is causing your bad breath so that you can be treated appropriately.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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