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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.

Musculoskeletal stiffness

17,752 total reports6.1% serious outcomes

17,752

Total Reports

Deaths

1,024

Hospitalizations

6.1

Severity Rate

% serious outcomes

About Musculoskeletal stiffness Reports

Musculoskeletal stiffness has been reported 17,752 times in VAERS from 1990 to 2026.

Of these reports, 52 were associated with death (0.29%) and 1,024 involved hospitalization.

The overall serious outcome rate (death or hospitalization) for reports mentioning Musculoskeletal stiffness is 6.1%.

Understanding Musculoskeletal stiffness in VAERS

•Temporal association only: These reports show Musculoskeletal stiffness 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 Musculoskeletal stiffness. 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.