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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.
Hypersomnia
5,523 total reports8.7% serious outcomes
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5,523
Total Reports
107
Deaths
374
Hospitalizations
8.7
Severity Rate
% serious outcomes
About Hypersomnia Reports
Hypersomnia has been reported 5,523 times in VAERS from 1990 to 2026.
Of these reports, 107 were associated with death (1.94%) and 374 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Hypersomnia is 8.7%.
Understanding Hypersomnia in VAERS
•Temporal association only: These reports show Hypersomnia 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 Hypersomnia. 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. COVID194,022
2. VARZOS506
3. FLU3243
4. HPV4239
5. PNC13175
6. COVID19-2158
7. UNK156
8. HIBV148
9. PPV142
10. FLU4135
Detailed Breakdowns
Quick Facts
Reports:5,523
Deaths:107
Hospitalizations:374
Mortality Rate:1.94%
Severity Rate:8.7%
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.