Several videos made public on the social network "Tik-Tok" where it is claimed that the Pfizer or Moderna vaccine causes breast growth have caused concern among women.
In an article from the prestigious "New York Times", experts say that in these cases we are dealing with enlargement of the lymph nodes. In other cases, they may be an early sign of cancer, but in the case of vaccination, there is another explanation that is fortunately unrelated to cancer.
According to experts, vaccines that use messenger RNA (mRNA), such as Pfizer and Moderna, deliver a small amount of genetic code to instruct cells how to copy the virus's surface protein, the "spike" protein, which activates the immune system. The lymph nodes contain B cells which use this information to generate antibodies in response to a foreign organism. The accumulation of antibodies in the lymph nodes can result in their enlargement.
This may cause the breasts to feel larger for a short time after the vaccine, but is not a cause for concern.
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