Recurrent atrophic gastritis is likely caused by Helicobacter pylori infection. When atrophic gastritis recurs, a Carbon-13 urea breath test or Carbon-14 urea breath test should be conducted to detect whether there is an infection of Helicobacter pylori. If the test is positive, a two-week quadruple therapy containing a bismuth agent should be used to eradicate Helicobacter pylori. Consider using a proton pump inhibitor, such as omeprazole or lansoprazole, combined with two of the antibiotics amoxicillin, clarithromycin, metronidazole, and furazolidone, as well as bismuth citrate, to form the quadruple therapy. (Please use medication under the guidance of a doctor.)