The cells of the adaptive immune system are special types of leukocytes, called lymphocytes. B cells and T cells are the major types of lymphocytes and are derived from hematopoietic stem cells in the bone marrow.
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Ulcers that occur in the stomach or small intestines are known as a peptic ulcers. A peptic ulcer in the stomach is also called a gastric ulcer. Ulcers may be caused by lifestyle factors like diet and stress, or an excess amount of stomach acids. However, the majority are caused by an infection caused by the bacterium Helicobacter pylori (H. pylori).