When Symptoms Worsen: Understanding the Adjustment Period The period following B12 injection therapy can be challenging for some patients, with symptoms sometimes temporarily intensifying before improvement becomes apparent
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There is After having a B12 shot, a person should monitor for adverse symptoms and seek medical help if they experience: severe pain at the injection site mild diarrhea a swelling sensation in the body temporary itching of the skin In rare cases, a person may also be at risk of: anaphylaxis pulmonary edema congestive heart failure peripheral vascular thrombosis, which involves blood clots polycythemia vera, which is a type of blood cancer If anyone experiences difficulty breathing, hives, or swelling, they need emergency medical help
Do not throw used needles into the garbage
If any of this sounds familiar, it could be your bodys way of telling you it needs more B12
PMID 25824066