Why would reactive gastritis be seen on endoscopy if low acid diet and h2 blockers are the norm? what other recommendations are there?

Gastritis causes: Gastritis (inflammation of the stomach) can be caused by excess stomach acid associated with smoking, alcohol or caffeine. Gastritis can also be due to anti-inflammatory medications (nsaids) e.G Aleve (naproxen), motrin/advil (ibuprofen) and others. Another cause: bile reflux after gallbladder removal. Diet has a minimal role and h2 blockers may need to be upgraded to ppi (prilosec, prevacid).