<unk>  (also known as Biermer's<unk>  or Addison's<unk>  or Addison-Biermer<unk>  is a form of megaloblastic<unk>  due to vitamin B12 deficiency dependent on  impaired absorption of vitamin B12 in the setting of atrophic gastritis, and more specifically of loss of gastric<unk> rietal cells. While the term<unk> <unk> " is sometimes also incorrectly used to indicate megaloblastic<unk>  due to any cause of vitamin B12 deficiency, its proper usage refers to that caused by atrophic gastritis and<unk> rietal cell loss only.<unk>  is a decrease in red blood cells that occurs when the body cannot properly absorb vitamin B12 from the gastrointestinal tract. Vitamin B12 is necessary for the proper development of red blood cells.<unk>  is a type of megaloblastic<unk> .
Pernicious anemia
Hemochromatosis
Zinc deficiency
Iron deficiency anemia
Hookworm infection
Chronic colestites
Taenia infection
Vacinko syndrome