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The large intestine and upper gastrointestinal tract are rarely affected

For many, arm pain is a fleeting inconvenience, but for others, it is the first step in managing and understanding this unexpected post-vaccination symptom

One of the most common causes of arm numbness is a pinched nerve in the neck , also known as cervical radiculopathy

While vitamin B12 injections are generally safe, some people may experience mild or temporary side effects: Redness, swelling, or mild pain at the injection site Dizziness or lightheadedness shortly after the B12 energy shot Nausea or upset stomach in rare cases Mild fatigue or feeling tired right after the vitamin injection Headache or brain fog (usually temporary) Mild fever Allergic reactions (rare) rash, itching, or shortness of breath Low potassium levels (very rare, but can happen with frequent vitamin shots in deficient individuals) Ready to Feel Like Yourself Again