The surprising cause of stomach ulcers – Rusha Modi

H. pylori spreads through contaminated food and water or unsanitary conditions. It can cause ulcers by growing in the lining of the stomach, producing inflammation and causing the stomach and intestinal lining to be more easily damaged by stomach acid.
NSAIDs that can lead to ulcers include popular over-the-counter pain relievers such as aspirin, ibuprofen and naproxen. They can irritate the stomach’s lining and may interfere with chemicals that help regulate the protective lining.
https://www.muhealth.org/our-stories/what-causes-stomach-ulcers-dont-assume-spicy-foods-are-blame