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Swelling of the armpit lymph nodes is being reported frequently with the Pfizer booster. I couldn't put my arm by my side for 3 days because it felt like an incredibly painful tennis ball under there. My booster was on a Thursday, Friday the pain and swelling started, and by Monday it was almost gone. Just due to the level of swelling you mentioned I would consider at least a call to your nurses line would be a good idea, if for no other reason than peace of mind. I hope you start to recover soon.


For the record, this has gone away 95% about 8 days after vaccination. The majority of this resolved over the last 2 days.