Megaloblastic anemia is a type of anemia, a blood disorder in which the number of red blood cells is lower than normal. Red blood cells transport oxygen through the body. When your body doesn’t have enough red blood cells, your tissues and organs don’t get enough oxygen.
There are many types of anemia with different causes and characteristics. Megaloblastic anemia is characterized by red blood cells that are larger than normal. There also aren’t enough of them. It’s known as vitamin B-12 or folate deficiency anemia, or macrocytic anemia, as well.
Megaloblastic anemia is caused when red blood cells aren’t produced properly. Because the cells are too large, they may not be able to exit the bone marrow to enter the bloodstream and deliver oxygen.