Causes of Hemangioma
Different types of hemangiomas are associated with different causes, although exactly why hemangiomas develop is not well understood. For example, infantile hemangiomas are caused by errors in the development of the vascular system that occur during fetal development but, in many cases, the event that caused the error cannot be identified. Some hemangiomas develop after an injury, but whether an injury can actually cause a hemangioma has not been proven. Some hemangiomas develop with pregnancy and go away afterward. Some hemangiomas are associated with genetic abnormalities (for example, cavernous hemangiomas in von Hippel-Lindau disease).

There has been no proven connection between the development of hemangiomas and any particular occupation or exposure to chemicals or radiation. In addition, no known food, medication, or activity during pregnancy is known to cause a hemangioma in an infant.