"Pernicious anemia" is a condition where the body does not have enough healthy red blood cells due to a deficiency of vitamin B12. It can make you feel tired, weak, and cause other health problems. Full definition
Multifocal gastric carcinoid tumor in a patient with pernicious anemia receiving lansoprazole. (emedicine.medscape.com)
Yet as early as 1974, an American study found that 92 percent of vegans, 64 percent of lactovegetarians, 47 percent of lacto - ovovegetarians and 20 percent of semi-vegetarians have blood levels below normal, that is, below the low range that marks the onset of pernicious anemia.10 (westonaprice.org)
Many people with B12 anemia discover they have an autoimmune disease called pernicious anemia, which inhibits the absorption of B12. (functionalhealthnews.com)