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Transparent access to VAERS data for informed decision-making. We present the data as-is, with appropriate context and disclaimers.

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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.

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  2. Vaccines
  3. COVID-19 Vaccine
  4. Thrombosis
COVID-19 Vaccine×Thrombosis

Thrombosis Reports for COVID-19 Vaccine

#136 most reported symptom for this vaccine

6,528
Reports
464
Deaths
2,320
Hospitalizations
7.11
Mortality Rate
%
35.5
Hosp. Rate
%

Thrombosis and COVID-19 Vaccine

Thrombosis has been reported 6,528 times in association with COVID-19 Vaccine vaccination in VAERS. This represents 0.6% of all 1,121,388 reports for this vaccine.

Among these reports, 464 mentioned death (7.11%) and 2,320 involved hospitalization (35.5%).

Thrombosis is the #136 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 6,528 reports of Thrombosis 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), Thrombosis appears in only 0.6% of reports.

The 7.11% 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 Thrombosis occurred after vaccination, not that the vaccine caused it.
•Background rates: Thrombosis 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 test normal6,654 reportsX-ray6,554 reportsUnresponsive to stimuli6,510 reportsLimb discomfort6,498 reports

Quick Facts

Reports:6,528
Deaths:464
Hospitalizations:2,320
% of Vaccine:0.6%
Rank:#136 of 9223

Related Pages

COVID-19 Vaccine OverviewThrombosis (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.