like all medications vaccines can have side effects. but the risk of harm or death from the influenza vaccine is rare. the flu shot and nasal spray can cause different types of side effects. flu shot side effects may include: low fever muscle aches soreness redness or swelling where the shot was given the nasal spray flu vaccine for adults may cause: cough headache muscle aches runny nose nasal congestion sore throat rarely someone may have a severe allergic reaction to an ingredient in the vaccine. most of the time such reactions occur within a few minutes to a few hours of receiving the vaccine. the following can be signs of a severe allergic reaction: behavior changes breathing difficulty including wheezing dizziness hoarse voice high fever hives pale skin rapid heart beat weakness seek immediate medical care if you notice any of these signs after receiving the influenza vaccine.
what are the side effects and risks for the adult flu vaccine?