Disease analysis: Spleen is located in the left upper abdomen and deep behind the rib arch. It is a reticular endothelial cell organ with dark red color and soft texture. The spleen of an adult is about the size of a palm and weighs about 200 grams. It hangs from the upper abdomen through several ligaments. Suggestion: Generally speaking, the spleen has three major functions. First, it is the "blood bank" of the human body, which stores blood when the human body is resting and quiet. Secondly, the spleen is like a "filter". When germs, antigens, foreign bodies and protozoa appear in the blood, macrophages and lymphocytes in the spleen will eat them. In addition, the spleen can also produce immune substances such as immunoglobulin and complement to play an immune role.