Last updated: 11/24/2009

In the United States, splenomegaly affects as many as 30% of full-term newborns and about 10% of healthy children. Approximately 3% of healthy first-year college students also have spleens that are large enough to be felt when a doctor palpates the...

abdomen. Some specific causes of splenomegaly are more common in certain racial or ethnic groups. For example, splenomegaly is a common complication of sickle cell disease in patients of African or Mediterranean ancestry. In other parts of the world, splenomegaly is frequently caused by malaria, schistosomiasis, and other infections in areas where these diseases are endemic.

Hereditary spherocytosis (HS) is a disorder is most common in people of northern European descent but has been found in all races. A family history of HS increases the risk of developing this disorder.

Immune thrombocytopenic purpura (ITP) is much more common in children, with male and female children being equally afflicted. Female predominance begins at puberty and continues in adult patients. Overall, 70% of patients with ITP are female; 72% of women diagnosed with ITP are over 40 years old.