There’s a lot of misinformation circulating about the Covid-19 vaccine. More and more people are wondering about the potential side effects of the vaccine. One of the most common questions we’ve been getting lately is, “Can you get cold sores from Covid 19 vaccine?”. Let’s take a look at the science behind this question.

Overview of Covid 19 Vaccine

The Covid-19 vaccine is a vaccine developed to protect people from the novel coronavirus disease, SARS-CoV-2. It works by stimulating an immune response in the body against the virus, helping it recognize and fight off infection should someone be exposed to it.

Can You Get Cold Sores from Covid 19 Vaccine

Overview of the Possibility 

There is no definitive answer to this question at this time. However, there are a few things we can look at in order to try to come to a conclusion. First, let’s take a look at what cold sores are and how they are caused. 

The Herpes Simplex Virus (HSV) is what causes cold sores. HSV is divided into two subtypes, HSV-1 and HSV-2. HSV-1 is usually responsible for cold sores, while HSV-2 is usually responsible for genital herpes. However, both viruses can cause either type of infection. 

The vast majority of people who have HSV-1 contracted it as children through close contact with someone who had a cold sore, such as kissing or sharing utensils, towels, etc. The virus enters the body through the mucous membranes or broken skin and attacks the nervous system. It then stays in the body for life, causing periodic outbreaks of cold sores. 

So, what does this have to do with the covid 19 vaccine? Well, it’s possible that the vaccine could trigger an outbreak of HSV-1 in people who have latent (dormant) infections. We know that other vaccines, such as flu vaccines, can sometimes trigger latent viral infections. However, it’s important to note that this is not a common side effect, and it does not happen to everyone who gets vaccinated. 

Potential Side Effects of Covid 19 Vaccine

It’s important to be aware of the potential side effects of any vaccine. The Covid-19 vaccine does not cause cold sores, but it can cause other side effects, such as pain or redness at the injection site, fever, chills, or fatigue. 

It is also possible that some people may experience an allergic reaction after getting the vaccine. These reactions are usually mild and will go away on their own, but it is important to seek medical attention if you experience any serious reactions.

Risks Associated with Receiving the Covid 19 Vaccine

It is important to understand that the vaccine may affect different people in different ways. People who are immunocompromised or have a history of allergic reactions should talk to their doctor before getting the vaccine. 

In addition, pregnant women and children under age 12 are not currently recommended to receive the Covid-19 vaccine due to a lack of safety data. People who have had an allergic reaction to a previous dose of the vaccine should not receive subsequent doses. 

It is also advisable that people who have recently had a cold sore should wait until the cold sore is healed before getting the vaccine.


So, can you get cold sores from Covid 19 vaccine? As of right now, there is no scientific evidence that the Covid 19 vaccine can cause cold sores. However, it is possible that the vaccine could trigger a latent HSV-1 infection in some people. You can also check our article on Do Cold Sores Pop Like Pimples?

If you have concerns about the vaccine or its potential side effects, talk to your doctor before getting vaccinated. It is also important to be aware of the risks associated with receiving the Covid 19 vaccine for different people and to follow any recommendations given by your doctor. 

Remember that immunization is one of the most effective ways to protect yourself and others against Covid 19. Vaccines are safe and effective, and the benefits of getting vaccinated far outweigh any potential risks.