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The causes of heart burn can be gastritis (stomach irritation due to Helicobacter pylori), peptic ulcer (again caused by H pylori) and Hiatal hernia; apart from reflux (GERD; gastroesophageal reflux disease). A 6 month heartburn would warrant an upper gastrointestinal endoscopy (camera exam) to look for above condition. The H. Pylori can be confirmed by other tests too. It is treated by a combination of medicines; Amoxicillin, Metronidazole and Zantac. This would abate the heartburn completely. Any other cause of heartburn is not very likely. So you should not worry.
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