Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Pernicious Anemia ?
    ### Response:
    Pernicious anemia is caused by a lack of intrinsic factor or other causes, such as infections, surgery, medicines, or diet.
                
Lack of Intrinsic Factor
                
Intrinsic factor is a protein made in the stomach. It helps your body absorb vitamin B12.
    