Plasma cells, also known as B cells, are actually distributed throughout the body much like lymphocytes, with the main locations being the spleen and various lymph nodes. Plasma cells are also part of the body’s immune system, for example, if the lymphocytes are infected, the antibodies produced by the plasma cells can protect the lymphocytes and the body from viral or bacterial infections. Plasma cells are usually round or oval in shape, relatively small in size, blue in color, and can be seen in large reticulations under an electron microscope. If symptoms such as anemia, enlarged lymph nodes, or an enlarged spleen occur, it is necessary to go to a nearby regular hospital to check the blood and urine routine to see if there is any abnormality in the plasma cells, and then take active treatment under the guidance of the doctor.