Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Pernicious Anemia ?
    ### Response:
    A lack of vitamin B12 (vitamin B12 deficiency) causes the signs and symptoms of pernicious anemia. Without enough vitamin B12, your body can't make enough healthy red blood cells, which causes anemia.
                
Some of the signs and symptoms of pernicious anemia apply to all types of anemia.
    