Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Aplastic Anemia ?
    ### Response:
    Damage to the bone marrow's stem cells causes aplastic anemia. When stem cells are damaged, they don't grow into healthy blood cells.
                
The cause of the damage can be acquired or inherited. "Acquired" means you aren't born with the condition, but you develop it.
    