Are there any side effects to the 2009 H1N1 influenza vaccine?
The side effects from 2009 H1N1 flu shots are expected to be like those from seasonal flu shots. The most common side effects after flu shots are mild, such as being sore and tender, red and swollen where the shot was given.
Some people might have headache, muscle aches, fever, and nausea or feel tired. If these problems happen, they usually begin soon after the shot and may last as long as 1-2 days. Some people may faint after getting any shot.
Sometimes, flu shots can cause serious problems like severe allergic reactions. But, life-threatening allergic reactions to vaccines are very rare. A person who has a severe (life-threatening) allergy to eggs or to anything else in the vaccine should not get the shot, even if she is pregnant. Pregnant women should tell the person giving the shots if they have any severe allergies or if they have ever had a severe allergic reaction following a flu shot.
Last Updated: 09/14/2009
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