Phlegmonous gastritis is caused by numerous microorganisms. Phlegmonous refers to diffuse inflammation. Common risk factors are debilitated health, massive alcohol consumption, and immunocompromised patient. In very severe cases, gangrene of the stomach may occur. Reference: https://www.medscape.com/answers/175909-44755/what-is-phlegmonous-gastritis#:~:text=Phlegmonous%20gastritis%20is%20an%20uncommon Image via: https://www.semanticscholar.org/paper/Phlegmonous-gastritis-after-endoscopic-submucosal-Ajibe-Osawa/4073377b804d6f797ab7a698e126458c1c377d0e/figure/2