Gastritis is a redness and swelling (inflammation) of the stomach lining. It can be caused by drinking too much alcohol, eating spicy foods, or smoking. Some diseases and other health issues can also cause gastritis. Symptoms may include stomach pain, belching, nausea, vomiting, abdominal bleeding, feeling full, and blood in vomit or stool.
https://www.hopkinsmedicine.org/health/conditions-and-diseases/gastritis

