The spleen is an organ located in the upper-left of the abdomen that filters lymph fluid and creates lymphocytes for the destruction and recycling of old red-blood cells. The spleen is also a blood reservoir, supplying the body with blood in emergencies such as a bad cut. It is also the location where white blood cells trap organisms.
During and after digestion, the size of the spleen increases. Infection of malaria or mono can also cause the spleen to increase in size, as well as rheumatoid arthritis, systemic lupus, sickle cell anemia, leukemia, and lymphoma.
If the size of the spleen increases significantly, it can rupture. Direct injury can also cause rupture. Rupture and certain cancers are the two cases where removal may occur.
Further Reading:
Spleen Meridian Structure, Function, & Balancing Tips