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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. COVID-19 Vaccine
  4. Vaccination site warmth
COVID-19 Vaccine×Vaccination site warmth

Vaccination site warmth Reports for COVID-19 Vaccine

#194 most reported symptom for this vaccine

4,025
Reports
0
Deaths
15
Hospitalizations
0
Mortality Rate
%
0.4
Hosp. Rate
%

Vaccination site warmth and COVID-19 Vaccine

Vaccination site warmth has been reported 4,025 times in association with COVID-19 Vaccine vaccination in VAERS. This represents 0.4% of all 1,121,388 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 15 involved hospitalization (0.4%).

Vaccination site warmth is the #194 most frequently reported symptom for COVID-19 Vaccine out of 9223 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 4,025 reports of Vaccination site warmth after COVID-19 Vaccine vaccination may seem alarming, but context is critical. With 1,121,388 total reports for this vaccine (representing many millions of doses), Vaccination site warmth appears in only 0.4% of reports.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

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

Laboratory test normal4,076 reportsExposure to SARS-CoV-24,067 reportsEye swelling3,979 reportsC-reactive protein increased3,934 reports

Quick Facts

Reports:4,025
Deaths:0
Hospitalizations:15
% of Vaccine:0.4%
Rank:#194 of 9223

Related Pages

COVID-19 Vaccine OverviewVaccination site warmth (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.