An eroded, irritated, or inflamed stomach lining is called gastritis. Acute onset is possible, but chronic onset is also possible (chronic). Potential problems include internal bleeding, stomach ulcers, and stomach cancer. Gastritis has two main root causes:
1) Helicobacter pylori, also known as H. pylori
2) NSAIDs, or nonsteroidal anti-inflammatory drugs (NSAIDs).
Nonetheless, there are a multitude of other potential triggers, including but not limited to other infectious agents, autoimmune issues, and diseases like Crohn’s, sarcoidosis, and isolated granulomatosis gastritis.