<prompt> Chronic gastritis is caused by all exceptH. PyloriPernicious anemiaAlcoholOveruse of salicylates  <response>: Overuse of salicylates NSAIDs cause acute gastritisGastritisGastritis is the inflammation of Gastric mucosa.It is a histological diagnosis and can be divided into -A. Acute gastritisIt is acute mucosal injury, usually transient in injury and is associated with neutrophilic infiltration.Important causes areHeavy use of NSAIDs aspirin Alcohol and smoking Uremia Ischemia and shockSevere stress Trauma, burn, surgeryNasogastric intubationB. Chronic gastritisIt is characterized by the presence of chronic mucosal inflammatory changes leading eventually to mucosal atrophy and intestinal metaplasia, usually in the absence of erosions.Important causes areH.pylori infection Alcohol and smoking Radiation Autoimmune, in association with pernicious anemiaGranulomatous conditions Crohn diseaseMiscellaneous - Amyloidosis, graft - versus - host disease, uremia. 