ISO (International Organization for Standardization) envelope sizes are the official international metric envelope sizes; however, Japan uses JIS (Japan Industrial Standard) and metricated traditional envelope sizes. N.B.
Peptic ulcers are holes or breaks in the protective lining of the duodenum (the upper part of the small intestine) or the stomach -- areas that come into contact with stomach acids and enzymes. Duodenal ulcers are more common than stomach ulcers.Comparatively rare are esophageal ulcers, which form in the esophagus -- or swallowing tube -- and are often a result of exposure to medications, like certain antibiotics or anti-inflammatories, or alcohol abuse.veruse of over-the-counter painkillers (such as aspirin, ibuprofen, and naproxen), heavy alcohol use, psychological stress, and smoking exacerbate and may promote the development of ulcers, especially in someone with H. pylori. Other studies show that stomach ulcers are more likely to develop in older people.
Both types of peptic ulcers are most commonly caused either by infection with Helicobacter pylori (H. pylori) bacteria or by frequent use of nonsteroidal anti-inflammatory drugs (NSAIDs). The symptoms of gastric ulcers and duodenal ulcers are similar, except for when pain occurs. 1  Pain from a gastric ulcer often occurs when food is still in the stomach, shortly after eating.  Pain from a duodenal ulcer often occurs when the stomach is empty, several hours after eating, and may improve after eating.