Swelling After COVID-19 Shots May Cause Cancer False Alarms

Getting a mammogram or other cancer check soon after a COVID-19 vaccination? Be sure to tell the doctor about the shot to avoid false alarm over a temporary side effect. That's the advice from cancer experts and radiologists. Sometimes lymph nodes, especially in the armpit, swell after the vaccinations. It's a normal reaction by the immune system but one that might be mistaken for cancer if it shows up on a mammogram or other scan.
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