Patients with bad breath and frequent belching (burping) may be suffering from Helicobacter pylori, which may also be caused by esophageal reflux disease and digestive disorders. 1. Helicobacter pylori infection: Helicobacter pylori infection is the main factor leading to gastritis, gastric ulcer, gastric cancer and other diseases, which affects the gastrointestinal function of the patient, leading to indigestion symptoms, resulting in bad breath and frequent belching. The diagnosis can be clarified through the examination of C13 and C14 breath test. 2. Esophageal reflux disease: due to esophageal sphincter relaxation, pancreatic achalasia and other reasons, resulting in gastroesophageal reflux disease, stomach contents through the esophagus back into the oral cavity, there will also be bad breath and frequent belching symptoms. 3. Digestive dysfunction: patients due to physical weakness, gastrointestinal function is poor, resulting in gastrointestinal peristalsis slower, digestive dysfunction, resulting in indigestion, or constipation, will also appear the above symptoms. If the above symptoms occur, you must consult a doctor in time to find out the specific cause, targeted treatment, do not miss the condition.