Heartburn. Is it serious? It might be. Heartburn is caused when acid in the stomach refluxes into the lower esophagus. The stomach has good protection against acid, but the esophagus doesn’t
https://idahostatejournal.com/news/local/the-ups-and-downs-of-heartburn/article_32d4ca94-6578-5429-9a0f-5e2530dd0c5f.html
The ups and downs of heartburn