Viral Videos Claim Pfizer COVID-19 Vaccine Increases Breast Size

A video with over three million likes on a popular video-sharing social media app claims that the vaccine recipient’s breasts grew two cup sizes after getting the Pfizer shot. The video is one of many making similar claims on the platform, while a search of the term “Pfizer Boob” on Twitter turns up hundreds of tweets from people making similar claims or expressing hopes or fears of a similar reaction happening if they were to get the vaccine. A side effect of vaccination is the temporary swelling of the lymph nodes. Swelling of lymph nodes in the chest could potentially explain why some people experienced what they thought was increased breast size shortly after vaccination.

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