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Adverse Reaction to the Flu Vaccine

The flu vaccine offers protection against influenza, a potentially serious respiratory illness. Some people experience side effects after receiving the flu vaccine, but serious adverse reactions are rare, according to the Centers for Disease Control (CDC).

  1. Reactions to Flu Shot

    • The flu shot can cause pain, swelling and redness at the injection site. Eye irritation, hoarseness, coughing, fever and body aches are also possible and may last for a day or two after the flu shot.

    Reactions to Nasal Spray

    • The live, attenuated influenza vaccine (LAIV) is a nasal spray, and it may cause runny nose, nasal congestion, coughing, chills, fatigue, sore throat and headache in adults.

    Reactions to Nasal Spray in Children

    • In addition to nasal symptoms, coughing and headache, some children and teens have experienced muscle aches, fever, wheezing, vomiting and diarrhea after the receiving the nasal spray, according to the CDC.

    Severe Reactions

    • Severe reactions are rare, according to the CDC. If a severe allergic reaction to the vaccine occurs, a person may begin wheezing and have trouble breathing. Hoarseness, hives, paleness, weakness, dizziness and an increased heart rate are other signs of a serious adverse reaction, according to the CDC.

    Warning

    • Seek immediate medical attention in the event of a severe allergic reaction. The CDC advises anyone receiving the vaccine to seek medical help for any other unusual symptoms that arise after vaccination.

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