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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Crohn's disease, colon cancer, or any disease that causes intestinal obstruction, may also cause abdominal bloating. Internal hernias or adhesions (scar tissue) from surgery may cause bloating or pain. Fatty foods can delay stomach emptying and cause bloating and discomfort, but not necessarily too much gas.