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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.
Somnolence
17,996 total reports13.0% serious outcomes
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17,996
Total Reports
298
Deaths
2,047
Hospitalizations
13
Severity Rate
% serious outcomes
About Somnolence Reports
Somnolence has been reported 17,996 times in VAERS from 1990 to 2026.
Of these reports, 298 were associated with death (1.66%) and 2,047 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Somnolence is 13.0%.
Understanding Somnolence in VAERS
•Temporal association only: These reports show Somnolence 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 Somnolence. 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. COVID199,509
2. HIBV2,671
3. OPV2,176
4. HEP1,973
5. DTP1,879
6. DTAP1,762
7. MMR1,532
8. IPV1,348
9. VARZOS806
10. FLU3805
Detailed Breakdowns
Quick Facts
Reports:17,996
Deaths:298
Hospitalizations:2,047
Mortality Rate:1.66%
Severity Rate:13.0%
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.