The Centers for Disease Control says side effects, if any, from the H1N1
vaccine should be rare. According to the CDC, you might experience the
same possible side effects as taking the seasonal flu shot.
When taking the shot version, the CDC says you could possibly experience
soreness, redness, or swelling in the shot area. You may experience a
low grade fever, aches and even some nausea.
As for the nasal spray, the CDC says children could experience some side
effects like a runny nose, wheezing, headache, vomiting, muscle aches
even a fever. Adults could see some of the same things, like the runny
nose, headache, a sore throat and cough.