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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.
Syncope
38,758 total reports9.6% serious outcomes
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38,758
Total Reports
552
Deaths
3,183
Hospitalizations
9.6
Severity Rate
% serious outcomes
About Syncope Reports
Syncope has been reported 38,758 times in VAERS from 1990 to 2026.
Of these reports, 552 were associated with death (1.42%) and 3,183 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Syncope is 9.6%.
Understanding Syncope in VAERS
•Temporal association only: These reports show Syncope 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 Syncope. 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. COVID1921,762
2. HPV46,607
3. MNQ4,126
4. TDAP3,189
5. HPV92,777
6. FLU32,294
7. HEPA2,178
8. MMR1,703
9. FLU41,645
10. HEP1,533
Detailed Breakdowns
Quick Facts
Reports:38,758
Deaths:552
Hospitalizations:3,183
Mortality Rate:1.42%
Severity Rate:9.6%
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.