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Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.
Local swelling
4,321 total reports4.4% serious outcomes
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4,321
Total Reports
2
Deaths
189
Hospitalizations
4.4
Severity Rate
% serious outcomes
About Local swelling Reports
Local swelling has been reported 4,321 times in VAERS from 1990 to 2026.
Of these reports, 2 were associated with death (0.05%) and 189 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Local swelling is 4.4%.
Understanding Local swelling in VAERS
•Temporal association only: These reports show Local swelling occurred after vaccination, not necessarily because of vaccination.
•Background rates matter: Many symptoms occur naturally at baseline rates in the population, unrelated to vaccination.
•Reporting variability: Medical terminology may be used differently by various healthcare providers and over time.
•Investigation needed: High-frequency reports may trigger further epidemiological studies to determine causation.
What This Data Shows
Most Associated Vaccines: The vaccines most frequently mentioned in reports with Local swelling. This may reflect usage patterns, not causation.
Severity Patterns: The percentage of reports that involve serious outcomes can help prioritize safety investigations.
Reporting Trends: Changes in reporting frequency over time may reflect increased awareness, media attention, or actual safety signals.
Most Associated Vaccines
1. FLU31,462
2. PPV1,294
3. TDAP668
4. VARZOS639
5. MNQ309
6. VARCEL305
7. HPV4278
8. MMR265
9. FLUX264
10. FLU4203
Detailed Breakdowns
Quick Facts
Reports:4,321
Deaths:2
Hospitalizations:189
Mortality Rate:0.05%
Severity Rate:4.4%
Related Analysis
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Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.