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

Dear Mayo Clinic: A friend of mine shared that she went for her annual mammogram last week. At the appointment, she was asked whether she had been vaccinated for Covid-19 and had experienced any changes in her breasts. I recently received my first dose of a Covid-19 vaccine. Although I feel fine, I’m wondering if there is a connection between being vaccinated for Covid-19 and increased risk for breast issues? I am due for my mammogram appointment in a few weeks.

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.

This has raised questions about whether screening mammograms should be rescheduled due to concerns that this finding could be mistaken for a potential breast cancer diagnosis.

Mayo Clinic’s recommendation is that women should not delay preventive screening.

Regardless of whether or not you have been vaccinated for Covid-19, you should come in for your mammogram as scheduled.

However, you should let your mammography technologist know that you’ve been vaccinated for Covid-19, as well as how many doses you’ve received and which arm it was administered in.

This information will be helpful in understanding the mammogram images.

In your specific situation, you may want to consider having your mammogram before your next vaccine dose.

If that is not possible, make sure you communicate with the technologist about your vaccination status.

Lymph nodes are part of your body’s germ-fighting immune system.

Your lymph nodes, also called lymph glands, play a vital role in your body’s ability to fight off infections.

They function as filters, trapping viruses and bacteria before they spread to other parts of the body.

This is why swollen lymph nodes are common in many people when they are ill.

Common areas where you might notice swollen lymph nodes include your neck, under your chin, in your armpits and in your groin.

When someone receives a vaccine, the lymph system is activated.

Swollen lymph nodes are a common and harmless reaction to many vaccines, including for Covid-19.

They typically occur under the arm where the shot was given.

The swelling is a sign that your body is responding to the vaccine.

Depending on the amount of swelling, some people may notice that their lymph nodes are larger and tender or painful to the touch.

The challenge is that when your healthcare team sees swollen lymph nodes on a mammogram, they will want to evaluate it further.

With the reports of swollen lymph nodes related to Covid-19 vaccination, your healthcare team will want to be particularly vigilant and ensure that the swollen lymph nodes are related to the vaccine and not breast cancer.

It is also important to note that swollen lymph nodes are not seen in every woman who has been vaccinated for Covid-19.

Most patients do not show changes in lymph node size on mammography.

For those patients who feel swollen lymph nodes in their underarm, the current standard would be to perform a mammogram and ultrasound of the area.

If enlarged lymph nodes are seen on your mammogram, but you are asymptomatic, an ultrasound will likely be recommended for further evaluation.

You may be asked to return for a repeat scan in three months.

Covid-19 has put everyone on alert, but my advice to women in general is that if you cannot have your mammogram prior to being vaccinated, keep your appointment and inform the technologist about your vaccination.

Encourage your family and friends to stay up to date with their preventive screenings too.

I also tell my patients that any skin changes – swelling of the breast, new lumps or bumps, or nipple discharge – should be checked out.

And that goes for both women and men as breast cancer can affect both sexes.

Early detection of breast cancer saves lives, so for that reason, regardless of what’s happening in the world, it’s important to not delay your breast cancer screening.

Patients with cancer are at an increased risk for developing severe Covid-19 and being vaccinated is one tool to help prevent infection.

We are seeing guidelines that say women at any stage of breast cancer treatment should be vaccinated for Covid-19 if they’re able.

I encourage all cancer patients to be vaccinated for Covid-19 when it is available.

But regardless of whether you are vaccinated or not, it is still important to practice safe behaviours, including wearing a face mask in public, practising physical distancing and performing proper hand hygiene. – By Dr Kristin Robinson/Mayo Clinic News Network/Tribune News Service

Dr Kristin Robinson is a radiologist with Mayo Clinic in Jacksonville, Florida, United States. Information in this post was accurate at the time of its posting. Due to the fluid nature of the Covid-19 pandemic, scientific understanding, along with guidelines and recommendations, may have changed since the original publication date.

Article type: metered
User Type: anonymous web
User Status:
Campaign ID: 46
Cxense type: free
User access status: 3
Join our Telegram channel to get our Evening Alerts and breaking news highlights

Next In Health

Vaping the new battlefront in war against smoking
Let's get the anti-vaxxers to change their minds
Finding ways to adjust to uncertain times
Future vaccines might be sprayed into the nose
It's not difficult to boost your immunity naturally
Nasal swabs can predict Covid-19 severity
Rock on! Listening to heavy metal music might be good for kids
Keep your kids hydrated and healthy with these snacks during this hot weather
Just recovered from Covid-19? Don't jump straight into exercise
Covid-19 variants explained, and how the virus mutates in the human body

Stories You'll Enjoy