Specific Anemia Type
Alpha-thallesemia is commonly called h-disease and it is a genetic disorder of blood cell production in which only a portion of the proteins (globin chains) is affected.
The severity is determined by which chain is affected--generally there are 4 chains, conveniently name 1, 2, 3, 4.
It not possible to explain having <100 characters left here.
Check with your doc for more info.