Medically reviewed by Jane Kim, MD Key Takeaways Allergic reactions to the flu shot are very rare, affecting only one or two people per million doses.  If you have trouble breathing, hives, or ...
It's winter and with the holidays near, the 2025-2026 flu season has hit the U.S. with flu cases on the rise in New Jersey, with doctors urging those who haven't gotten the flu shot to do so now.