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A drawing of a spleen

The spleen is an organ in vertebrates. In people, it is on the left side of the body, under the heart. The spleen helps fight infections and keep the blood cells healthy.


The spleen cleans out old blood cells from the blood and recycles them. It helps save the iron and the amino acids from the old blood cells. The spleen also holds a supply of extra blood, in case the body needs some quickly. The spleen works together with the circulatory system (the system which brings blood to the body).

The spleen also helps fight infections. It makes special cells called red pulp and white pulp. The red pulp takes unwanted things out of the bloodstream. The white pulp helps fight infections. Still, a person does not need a spleen to survive.


The spleen is shaped like a loose fist. It is tucked under the left side of the diaphragm, close by the heart.The average adult spleen weighs 0.44 lbs.


The spleen can get bigger when a person is digesting food or is sick. If a person's spleen gets big enough, it can break open. If this happens, the person needs medical care right away. Emergency surgery might be needed to control the bleeding.

Some of the diseases that cause the spleen to get bigger are:


In the past, many people believed the spleen helped control emotions. For example, if a person was upset or angry, people would think it was because of a spleen problem.