As cases of COVID infection continue to mount across the globe, vaccination seems the only possible way to immunise from the contagious strain of the virus. But there is a large group of the population who are not willing to take the shot due to its emerging side effects. The truth is that not all vaccine side-effects are harmful to your health. Just like any other medication, it is normal to experience some pain, swelling, chills, headache, tiredness, and fever after the jab. As per the Centers for Disease Control and Prevention (CDC), these only indicate that your body is building protection against the virus. Some may experience these side-effects, others may not. It is quite difficult to make a presumption. But new research indicates that those who have already been infected with the virus are more likely to witness the vaccine side effects than those who have never come in contact with COVID strains.