I had mild side effects. But, yes, the Covid vaccine is the only vaccine I ever got side effects from. Except for tetanus. But tetanus was just like a light bruise. Covid was much worse. My first shot was as painful as an injury and made my left upper arm muscle hard for 3 days. I had a fever for about 9 hours the evening after my second shot. And felt like I had a cold the day after the third. But still, it was worth it. The weirdest thing was when I got the third shot, the spot where I got the first shot in my other arm started to hurt again and the muscle got hard and it hurt for about another 7 days.