South Korea has seen a few rare cases of people reporting heart issues after getting mRNA vaccines.
So far, NINE people in Korea have reported symptoms of the so-called Myocarditis or Pericarditis.
Only two were acknowledged as actually being linked to their Covid-19 vaccination.
But, what exactly are these two heart inflammatory diseases?
Pericarditis is the inflammation of the outer part of the heart. and Myocarditis is the inflammation of the heart muscle.
Severe chest pain, breathing difficulty, and a rare abnormal heartbeat are common symptoms in both cases.
Experts think those pains are not easy to distinguish from general muscle pain meaning it's necessary to get it checked.
"Myocarditis pain is hard to differentiate from any other pain. Within usually two to three days or up to two weeks people could get chest pain for no reason."
According to the U.S. CDC, around 4.1 people out of every million vaccinated show rare heart inflammation.
The expert added that these two common heart diseases usually improve by themselves.
"Pericarditis usually gets better by itself within one to two weeks, but still chest pain is a problem. It's not a dangerous disease but people can feel uncomfortable which can be treatable by medicine. Myocarditis improves after a certain period of time, but you need to be more careful with this one."
He said the benefits of vaccination still outweigh the risk of side-effects stressing that there is a much higher chance of having heart problems if you catch COVID-19.
The vaccination not only stops this from happening but prevents other serious complications from COVID-19.
Choi Won-jong, Arirang News.