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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. Measles, Mumps & Rubella (MMR II)
  4. Injection site oedema
Measles, Mumps & Rubella (MMR II)×Injection site oedema

Injection site oedema Reports for Measles, Mumps & Rubella (MMR II)

#9 most reported symptom for this vaccine

4,574
Reports
0
Deaths
77
Hospitalizations
0
Mortality Rate
%
1.7
Hosp. Rate
%

Injection site oedema and Measles, Mumps & Rubella (MMR II)

Injection site oedema has been reported 4,574 times in association with Measles, Mumps & Rubella (MMR II) vaccination in VAERS. This represents 5.1% of all 89,976 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 77 involved hospitalization (1.7%).

Injection site oedema is the #9 most frequently reported symptom for Measles, Mumps & Rubella (MMR II) out of 2292 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 4,574 reports of Injection site oedema after Measles, Mumps & Rubella (MMR II) vaccination may seem alarming, but context is critical.

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 Injection site oedema occurred after vaccination, not that the vaccine caused it.
•Background rates: Injection site oedema 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

Urticaria5,259 reportsPruritus4,701 reportsInjection site warmth4,396 reportsInjection site pain4,173 reports

Quick Facts

Reports:4,574
Deaths:0
Hospitalizations:77
% of Vaccine:5.1%
Rank:#9 of 2292

Related Pages

Measles, Mumps & Rubella (MMR II) OverviewInjection site oedema (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.