A vitamin B12 deficiency is a common condition that occurs as a result of low or absent intrinsic factor. It may cause symptoms such as soreness of the mouth or tongue, numbness or tingling in the hands or feet, weakness, and weight loss. People with inflammatory bowel disease, elderly adults, and infants of mothers with this condition are at a higher risk for developing a deficiency. Healthcare providers will often initially treat the vitamin B12 deficiency with injections and then follow with oral supplementation.
(Click Vitamin B12 Deficiency for more information about this condition, including why it occurs, what symptoms may develop from it, and what treatments are available. You can also click any of the links in the box to the right for specific information.)