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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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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.

  1. Home
  2. Vaccines
  3. Influenza, Seasonal (Fluvirin)
  4. Muscle tightness
Influenza, Seasonal (Fluvirin)×Muscle tightness

Muscle tightness Reports for Influenza, Seasonal (Fluvirin)

#268 most reported symptom for this vaccine

220
Reports
1
Deaths
18
Hospitalizations
0.45
Mortality Rate
%
8.2
Hosp. Rate
%

Muscle tightness and Influenza, Seasonal (Fluvirin)

Muscle tightness has been reported 220 times in association with Influenza, Seasonal (Fluvirin) vaccination in VAERS. This represents 0.2% of all 119,695 reports for this vaccine.

Among these reports, 1 mentioned death (0.45%) and 18 involved hospitalization (8.2%).

Muscle tightness is the #268 most frequently reported symptom for Influenza, Seasonal (Fluvirin) out of 3021 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 220 reports of Muscle tightness after Influenza, Seasonal (Fluvirin) vaccination may seem alarming, but context is critical. With 119,695 total reports for this vaccine (representing many millions of doses), Muscle tightness appears in only 0.2% of reports.

The mortality rate among these reports is very low at 0.45%, suggesting most cases are non-fatal.

Important Context

•Association, not causation: These reports show Muscle tightness occurred after vaccination, not that the vaccine caused it.
•Background rates: Muscle tightness may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Blood glucose increased220 reportsPeripheral coldness220 reportsRespiratory disorder219 reportsNo reaction on previous exposure to drug217 reports

Quick Facts

Reports:220
Deaths:1
Hospitalizations:18
% of Vaccine:0.2%
Rank:#268 of 3021

Related Pages

Influenza, Seasonal (Fluvirin) OverviewMuscle tightness (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.