Enlarged lymph nodes after Covid-19 vaccination

Lymphatic nodes

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Lymph nodes are located in many body parts, such as the:

  • neck
  • armpit
  • chest
  • abdomen
  • groin.

They contain immune cells that can help fight infection by attacking and destroying germs. They become enlarged due to infections, cancer, and also vaccination.

Enlarged lymph nodes are generally a sign that your immune system is fighting an infection or illness.

After COVID-19 vaccination, lymph nodes might get enlarged in the axillary (underarm) region, closest to the to the injection site. However, this side effect can lead to confusion since this also happens to be one of the first symptoms of breast cancer. As a result, breast cancer screening should be postponed till after about 6 weeks since vaccination of the individual being screened. This helps to avoid any false breast cancer suspicion.

Be assured that enlarged lymph nodes after Covid-19 vaccination are a normal side effect and mean that your immune system has been triggered. In short, this means the vaccine is working.


Sydney Chako

Mathematics, Chemistry and Physics teacher at Sytech Learning Academy. From Junior Secondary School to Tertiary Level Engineering Mathematics and Engineering Science.

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