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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 (Fluad Quadrivalent)
  4. Tachycardia
Influenza, Seasonal (Fluad Quadrivalent)×Tachycardia

Tachycardia Reports for Influenza, Seasonal (Fluad Quadrivalent)

#100 most reported symptom for this vaccine

32
Reports
2
Deaths
19
Hospitalizations
6.25
Mortality Rate
%
59.4
Hosp. Rate
%

Tachycardia and Influenza, Seasonal (Fluad Quadrivalent)

Tachycardia has been reported 32 times in association with Influenza, Seasonal (Fluad Quadrivalent) vaccination in VAERS. This represents 0.8% of all 4,184 reports for this vaccine.

Among these reports, 2 mentioned death (6.25%) and 19 involved hospitalization (59.4%).

Tachycardia is the #100 most frequently reported symptom for Influenza, Seasonal (Fluad Quadrivalent) out of 673 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 32 reports of Tachycardia after Influenza, Seasonal (Fluad Quadrivalent) vaccination may seem alarming, but context is critical.

The 6.25% mortality rate among these reports is elevated, but this reflects the severity of the condition itself rather than vaccine causation.

Important Context

•Association, not causation: These reports show Tachycardia occurred after vaccination, not that the vaccine caused it.
•Background rates: Tachycardia 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

Electrocardiogram32 reportsSwelling face32 reportsJoint range of motion decreased31 reportsFeeling hot31 reports

Quick Facts

Reports:32
Deaths:2
Hospitalizations:19
% of Vaccine:0.8%
Rank:#100 of 673

Related Pages

Influenza, Seasonal (Fluad Quadrivalent) OverviewTachycardia (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.