WATCH: Understanding Side Effects You Feel From COVID Vaccine

So yesterday morning I got the Pfizer COVID vaccine; very easy walk-up process. And was feeling fine all day, except for my arm being sore. Fast forward to today! I could barely extend my arm fully upward this morning it was so sore. And I definitely feel very laggish today. (Is 'laggish' a word? Maybe sluggish is a better explanation!)

If you're experiencing the same, there's a great video from the Mayo Clinic explaining why we feel side effects from the vaccine shot! (Watch the video below)


(Photo: Getty Images)

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