The hypereosinophilic syndrome is a disease characterized by a persistently elevated eosinophil count. This is a type of white blood cell. If untreated it will lead to death.

The hypereosinophilic syndrome is a disease characterized by a persistently elevated eosinophil count. This is a type of white blood cell. If untreated it will lead to death.

An eosinophil count is a measure of the number of a specific type of white blood cell. A high count can mean an acute allergic reaction to a substance, early stages of Cushing disease, parasitical infection, or rarely, acute hypereosinophilic syndrome. The eosinophil count can be artificially raised by taking psyllium based laxatives, certain antibiotics, amphetamines, tranquilizers or interferon.

For the most part, elevated levels of vitamin B12 are not dangerous. However, there are a few diseases that may cause these levels to increase. These include hypereosinophilic syndrome, polycythemia Vera, and two forms of leukemia.