After receiving the flu vaccine, people sometimes experience achy muscles, fever, headaches, and pain at the injection site.

Every year, flu vaccines are updated to match the flu viruses expected to circulate. For 2026, the vaccine focuses on several influenza strains that research predicts will be most prevalent. This ...

Limiting alcohol, intense exercise, and pain relievers after a flu shot may decrease side effects and improve your immune response. Side effects from the flu shot may include soreness at the injection ...

Influenza A H3N2 subclade K has driven flu cases across the country, with 52 counties in Florida seeing increases over the past week. While the current flu vaccine might be a "mismatch," it still ...

Flu is making people miserable from coast to coast, thanks in large part to a new strain called subclade K. That’s why infectious disease experts are telling people to run, not walk, to get this ...

The vaccine, intended for people 50 and older, is based on mRNA technology and was found in an advanced trial to be more effective than a standard flu shot. An expert committee at the US Food and Drug ...