Severe Allergic Reaction
Although extremely rare, a person can have a severe allergic reaction to a flu vaccine known as anaphylaxis. Anaphylaxis includes signs like breathing difficulties, swelling in the throat, a fast heartbeat, dizziness, and a severe rash all over the body.
High Fever
A high fever occurring soon after the vaccination could be an indication of an allergic reaction. Although a low-degree fever is a common side effect of many vaccines, a high-degree fever is not and should be evaluated by a physician.
Hives or Rash
In some individuals, having hives or a rash after getting a flu vaccine is a sign of an allergic reaction. Hives are raised, itchy red bumps on the skin, and they often appear in clusters.
Facial Swelling
If the face or lips are swelling after taking the flu vaccine, this could indicate an allergic reaction. Swelling can also occur in the throat, restricting airways and making it harder to breathe.
Vomiting and Diarrhea
While gastrointestinal symptoms are rare in response to a flu vaccine, severe vomiting and diarrhea following vaccination could potentially indicate an allergic reaction.
Difficulty Breathing
An allergic reaction to the vaccine can cause the airways to narrow, leading to difficulty breathing or shortness of breath. This can also be accompanied by wheezing or a feeling of tightness in the chest.
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