It is training your body to make antibodies to fight the virus. Here’s why: The aim of the COVID-19 vaccine is to get your immune system to launch a response to what it thinks is the COVID-19 virus. Why would the vaccines cause swollen lymph nodes?īecause the COVID-19 vaccines are given in your arm, they can activate the lymph nodes in your armpit and cause swelling there.
Some people with breast cancer experience swollen lymph nodes in the armpit, which might cause anxiety after vaccination for women who don’t know to expect it. If you get a sexually transmitted disease or vaginal infection, the lymph nodes in your groin might swell. For example, if you have strep throat, the lymph nodes in your neck become swollen. The lymph nodes closest to the affected body part are usually the ones that swell. They are activated-and thus become swollen-when they detect a harmful substance and try to remove it from your body. They are located throughout your body, including in the neck, armpits and groin. Lymph nodes filter out harmful substances in your body, such as bacteria and viruses. “It’s normal after either a vaccination, an illness or infection for the lymph nodes to be enlarged because that’s where the big immune reaction is happening.” They recognize an illness and then activate the immune system,” says Brian Brimmage, MD, an obstetrician who delivers babies at UNC REX Healthcare. “Lymph nodes are primarily where your immune cells reside. This is your immune system at work, building up its defenses to COVID-19.
As more people are getting the coronavirus disease 2019 (COVID-19) vaccines, doctors are noticing an interesting-but not unusual-side effect: swollen lymph nodes, especially under the armpits.
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