The short check before a jab isn't a formality — it's an important safety step. Telling the truth about your allergy history lets the doctor choose the safest way to vaccinate you.
What to volunteer
- Severe allergic reactions to a vaccine: whether you've ever had difficulty breathing, facial swelling, collapse or other severe reactions after any vaccine.
- Food and drug allergies: for example egg, gelatin, certain antibiotics or other drugs. Some vaccine components relate to these.
- Medications you're taking: such as blood thinners, immunosuppressants or steroids, which can affect how or how well you're vaccinated.
- Other health conditions: such as pregnancy, immune-system disease, or a recent illness or fever.
Why it matters
This information helps the doctor decide whether vaccination is suitable, which vaccine to use (for example, an egg-protein-free option for someone with egg allergy), whether to vaccinate in a primary care clinic or a better-equipped facility, and how long to observe you afterwards.
The key point
Disclosing an allergy isn't about refusing you the jab — most people with allergies can still be vaccinated safely, just with the approach or location adjusted. Hiding it only adds risk. If you can't recall the details of a past reaction, tell the doctor anyway and let their judgment guide it.