The spleen is an organ in the upper left side of the abdomen
that filters the blood by removing old or damaged blood cells
and platelets and helps the immune system by destroying bacteria
and other foreign substances. It also holds extra blood that can
be released into the circulatory system, if needed. The spleen
is a useful but nonessential organ. It is sometimes removed
(splenectomy) in people who have blood disorders, such as
thalassemia or hemolytic anemia. If the spleen is removed, a
person must get certain immunizations to help prevent infections
that the spleen normally fights. eMedicineHealth Medical
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