Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Autoimmune atrophic gastritis ?
    ### Response:
    What are the signs and symptoms of autoimmune atrophic gastritis? In some cases, autoimmune atrophic gastritis does not cause any obvious signs and symptoms. However, some people may experience nausea, vomiting, a feeling of fullness in the upper abdomen after eating, or abdominal pain.
    