It’s HIGHLY variable on side effects from the Shingles vaccine. I had it, my H had it and my 90+ year old mom all had it. Mom and I had NO reaction other than mild tenderness at injection site for 24 hours. H felt like he had the flu both times he got the shoot & 2nd shot for about 36-48 hours. I got him to take Alleve sooner the 2nd shot so he felt better sooner, but people all react SO differently.