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the claim

The influenza vaccine causes headaches as a side effect.

the verdict
INSUFFICIENT LEANING
Recorded sources
3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the influenza vaccine causes headaches as a side effect?

Unclear. Two sources partially support the claim: a CDC page lists headache as a side effect of other vaccines (hepatitis B, HPV) but not influenza, and a review notes headache related to the influenza vaccine as a risk factor. A case-report letter states headache is a common influenza vaccine side effect, but the evidence is limited and not a comprehensive confirmation.

Verdict: PARTIAL LEAN · 3 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 3
Possible Side Effects from Vaccines | Vaccines & Immunizations | CDC
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Possible Side Effects from Vaccines | Vaccines & Immunizations | CDC. (n.d.). cdc.gov. https://www.cdc.gov/vaccines/basics/possible-side-effects.html

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More for · 2
Headache After Vaccination: An Update on Recent Clinical Trials and Real-World Reporting -
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Headache After Vaccination: An Update on Recent Clinical Trials and Real-World Reporting - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1007/s11916-022-01094-y

Influenza vaccine-induced interstitial lung disease
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Influenza vaccine-induced interstitial lung disease. (n.d.). cir.nii.ac.jp. https://doi.org/10.1183/09031936.00146912

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