Power Thesaurus. 1969. pancreas thesaurus http://www.powerthesaurus.org/pancreas/synonyms (accessed April 14, 2017).
Having vitamin B12 deficiency means that your body does not have enough of this vitamin. You need B12 to make red blood cells, which carry oxygen through your body. Not having enough B12 can lead to anemia, which means your body does not have enough red blood cells to do the job. This can make you feel weak and tired.Vitamin B12 deficiency can cause damage to your nerves and can affect memory and thinking.his can happen if: 1  You have pernicious anemia. 2  In this anemia, your body destroys the cells in your stomach that help you absorb vitamin B12. 3  You have had surgery to remove part of the stomach or the last part of your small intestine, called the ileum.
Vitamin B12 deficiency can happen if you have certain conditions, such as: 1  Atrophic gastritis, in which your stomach lining has thinned. 2  Pernicious anemia, which makes it hard for your body to absorb vitamin B12. 3  Surgery that removed part of your stomach or small intestine, including weight loss surgery.ou can also get vitamin B12 deficiency if you're a vegan (meaning you don't eat any animal products, including meat, milk, cheese, and eggs) or a vegetarian who doesn't eat enough eggs or dairy products to meet your vitamin B12 needs. Babies born to mothers who are vegetarians may also not get enough vitamin B12.