<prompt> Answer this question truthfullyWhat is the connection between acid and indigestion?  <response>: <reason> Acid indigestion was first discovered in the 1980s by a group of clinicians and researchers who at the time described it as discomfort behind the sternum retrosternal or in the abdominal region epigastric related to the gastrointestinal system, occurring within a time-frame of greater than four weeks. Patients were sub-classified into various groups based on cause, mechanism of disease, and presenting symptoms. This was done to assist clinicians in selecting the most appropriate therapy. These include: Reflux-like, ulcer-like, dysmotility-like, and unspecified dyspepsia . They disregarded the reflux-like subgroup with the opinion that they should be considered as having Gastro-esophageal Reflux Disease GERD until proven otherwise. Currently, this is widely accepted but still has an ongoing discussion. They concluded that acid indigestion should be described as pain only centered in the abdominal region epigastric without a specific duration . Irritable Bowel Syndrome IBS is also a diagnosis of exclusion . 