An ulcer is type of sore, which means it is very painful wound in stomach. A peptic ulcer is common health problems. Peptic ulcers are ulcers that form in stomach or the upper part of small intestine. This upper part of small intestine is called duodenum.
There are several cause of ulcers but decrease in stomach's mucus lining manly factor. But there common cause like infection with bacteria this bacteria weaken the stomach, long term usage excess of recommended dosage of drug's and Zollinger-Ellison syndrome which make the body produce stomach acid.