Stomach cold does not cause bad breath, but it is a factor that induces bad breath. There are more causes of bad breath, the common ones are periodontitis, mouth ulcers, dental caries, poor oral cleaning and other factors. If the cavity of tooth decay is deeper, there are more food residue corrosion and fermentation, it will also cause bad breath, and you can also go to the stomatology department of the hospital for treatment. Most patients with stomach cold will not cause bad breath to appear, but it will induce bad breath. Stomach cold is mainly caused by deficiency of spleen and Yang, which can lead to the patient’s preference for spicy and stimulating foods, which can cause symptoms of fire in the stomach for a long time, resulting in heat up and cold down, and gastrointestinal indigestion. After food intake, the gastrointestinal tract is unable to digest properly, thus causing symptoms such as stomach discomfort, diarrhea, nausea and vomiting. As the food cannot be digested and remains in the stomach for a long time, bad breath is manifested when excessive fermentation causes belching.