After vaccination, side effects such as headache, fatigue, and fever are often seen in the body. Due to this many people also start panicking. But experts say that in most people, these symptoms are a sign that the immune system is becoming more active in the body.
According to experts, the body gives such a normal response to any vaccine. However, to understand why these side effects occur, we need to understand our immune system.
Two parts of immunity work
The immune system has two major parts. The first of these comes into action as soon as an intruder is detected. White blood cells (WBC) start accumulating at the respective site. This leads to inflammation in the body, which causes chills, pain, fatigue, and other side effects.
This accelerated activation of the immune system tends to decline with age. This is the reason that the side effects of vaccines are more visible in the youth than in the elderly. But it is also true that some vaccines cause a comparatively greater physical reaction.
However, everyone's body reacts differently to vaccines. If you do not feel anything for a day or two after the first or second dose, it does not mean that the vaccine is not working. In fact, after a vaccine, another part of the immune system is silently involved in making antibodies against the associated germ.
swollen lymph nodes
As soon as the immune system is activated, sometimes the lymph nodes (lymph glands) become swollen for some time. For this reason, women are advised to have regular mammograms before getting the corona vaccine. So that suddenly the swollen node is not mistaken for cancer.
some rare side effects
Usually, not all side effects are common. Despite intensive security monitoring around the world, some serious risks have emerged. For example, blood clots have occurred in a very small number of populations that have received the AstraZeneca and Johnson & Johnson vaccines.
Similarly, there have been reports of a rare side effect of temporary swelling of the heart due to mRNA vaccines (Pfizer, Moderna), which is being investigated. But regulators say the benefits of these vaccines far outweigh the side effects.