How B12 Deficiency Contributes to Nerve Damage Not enough Vitamin B12 can cause nerve problems
One major study found that 39% of the general population had borderline or deficient B12 levels, with no significant difference between meat-eaters and vegetarians suggesting that how well your body absorbs B12 matters as much as how much you consume
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PMID 11148506
Endoscopy may also be done to check how your stomach is doing
If side effects do occur, they are generally mild and may include: Pain, discomfort, swelling, or redness at the injection site Diarrhea Headache Bloating Nausea Numbness or tingling Serious side effects are rare and may include: Confusion Dizziness or fainting Muscle pain, cramps, or weakness Extreme thirst Facial flushing Frequent urination Palpitations Fatigue Difficulty breathing Coughing or noisy breathing (wheezing) Extreme pain, swelling, warmth or tenderness in one leg Difficulty swallowing Rash Itching over the body If you experience serious side effects, contact your doctor right away