Vitamin B12 deficiency, also known as cobalamin deficiency, is the medical condition of low blood and tissue levels of vitamin B12. In mild deficiency, a person may feel tired and have a reduced number of red blood cells (anemia). In moderate deficiency, soreness of the tongue, apthous ulcers, breathlessness, jaundice, hair fall and severe joint pain (arthralgia) may occur, and the beginning of neurological symptoms, including abnormal sensations such as pins and needles, numbness and tinnitus. Severe ...
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