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Pernicious anemia is the most common cause of clinically evident vitamin B 12 deficiency worldwide. [14] Pernicious anemia due to autoimmune problems occurs in about one per 1000 people in the US. Among those over the age of 60, about 2% have the condition. [8] It more commonly affects people of northern European descent. [2]
Vitamin B 12 deficiency can be determined, but not always. [14] This means it measures forms of vitamin B 12 that are "active" and can be used by the body, as well as the "inactive" forms, which cannot. [151] Vitamin B 12 deficiency can be found within normal levels, so clinical symptoms should be taken into account when a diagnosis is made. [2]
The blind loop syndrome may produce deficiency of vitamin B 12 or folate. Inadequate use of vitamin B 12, which may occur if antimetabolites for the vitamin are employed in the treatment of neoplasia; Pernicious anemia is the most common cause of vitamin B 12 deficiency. [17]
[6] [15] [26] Vitamin B 12 deficiency can also cause symptoms of mania and psychosis. [27] [28] Among other problems, weakened immunity, reduced fertility and interruption of blood circulation in women may occur. [29] The main type of vitamin B12 deficiency anemia is pernicious anemia, [30] characterized by a triad of symptoms:
“A B12 deficiency can cause physical and neurological symptoms, and research is also growing to support that it can also cause psychological issues as well,” says Shapiro. The list of ...
Deficiency can also result from rare genetic factors, such as mutations in the MTHFR gene that lead to compromised folate metabolism. [33] [34] Cerebral folate deficiency is a rare condition in which concentrations of folate are low in the brain despite being normal in the blood. [35] Vitamin B 12 deficiency: Anemia, neurological and digestive ...
Over time, a deficiency of B12 can cause problems with balance, confusion, depression, poor memory and possibly dementia, and it can even cause permanent damage to the nervous system, Somers says.
In general, the most common cause of this condition is a deficiency of vitamin B 12. This may be due to a dietary deficiency, malabsorption in the terminal ileum , lack of intrinsic factor secreted from gastric parietal cells, or low gastric pH inhibiting attachment of intrinsic factor to ileal receptors. [ 10 ]
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