Subtraction is the inverse of addition. 2. Either of two numbers or quantities that cancel each other out under a given mathematical operation. For example, the inverse of 5 under multiplication is 1 / 5, since 5 Ã 1 / 5 = 1.
Peptic ulcer disease refers to painful sores or ulcers in the lining of the stomach or first part of the small intestine, called the duodenum. No single cause has been found for ulcers. However, it is now clear that an ulcer is the end result of an imbalance between digestive fluids in the stomach and duodenum. Most ulcers are caused by an infection with a type of bacteria called Helicobacter pylori (H. pylori).
A peptic ulcer is a sore in the inner lining of the stomach or upper small intestine . Ulcers form when the intestine or stomach's protective layer is broken down. When this happens, digestive juices-which contain hydrochloric acid and an enzyme called pepsin-can damage the intestine or stomach tissue. Treatment cures most ulcers. And symptoms usually go away quickly. Peptic ulcers that form in the stomach are called gastric ulcers. Those that form in the upper small intestine are called duodenal (say doo-uh-DEE-nul or doo-AW-duh-nul) ulcers.