Common symptoms of a vitamin B12 deficiency include: Tiredness Lethargy Feeling faint Breathlessness Less common symptoms include: Headaches Heart palpitations Altered taste Loss of appetite Ringing in the ears (tinnitus) Looking pale Sore mouth and tongue If it is left untreated you can end up with longer term problems including: Psychological problems such as depression, confusion, memory problems Nerve problems such as numbness, pins and needles, vision changes and unsteadiness A blood test can indicate if you have a B12 deficiency
For example, someone with severe B12 deficiency and neurological symptoms might need more frequent injections at first
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View all FAQs Important safety information and common side effects The most commonly reported side effect is irritation of the area where the injection is administered. If this occurs, consider changing placement on the body or use injections less often
Family Medicine Physician with 20+ years in Family Medicine focused on nutrition, wellness, and whole-person health