If you’ve heard problems with your gut can cause bad breath, you may be wondering if that’s true — and how to cure bad breath coming from your stomach. Digestive conditions, including stomach ulcers, acid reflux, and gastroesophageal reflux disease (more commonly known as GERD), can prevent or delay digestion of food in the stomach. The undigested food doesn’t move along, and it causes bad breath if it remains stuck long enough to decay. If you experience bad breath due to digestive issues, the key is to approach the root of the problem. Practice good oral hygiene and use a mouthwash designed to eliminate and prevent bad breath. And also deal with what’s happening in your stomach. Discuss your symptoms with your doctor. You may be able to reduce acid reflux or GERD without medication with these steps: Eat smaller, more frequent meals, Avoid food and drink triggers such as spicy foods, fatty foods, coffee, chocolate, carbonated beverages, and alcohol, Eat a couple of hours before vigorous exercise, Sleep on an incline, Quit smoking. Be sure to ask your doctor whether medications you take may increase your likelihood of experiencing reflux.