Swollen lymph nodes after Covid-19 vaccination could be mistaken for breast cancer

Swollen lymph nodes are a sign of breast cancer, but can also be due to a Covid-19 vaccine if the patient was vaccinated just before their mammogram. — Wikimedia Commons

In some women, breast cancer can present with lymph nodes that are swollen under one arm.

Some patients have reported developing swollen lymph nodes after a Covid-19 vaccination.