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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. Muscle twitching
Measles, Mumps & Rubella (MMR II)×Muscle twitching

Muscle twitching Reports for Measles, Mumps & Rubella (MMR II)

#96 most reported symptom for this vaccine

589
Reports
2
Deaths
106
Hospitalizations
0.34
Mortality Rate
%
18
Hosp. Rate
%

Muscle twitching and Measles, Mumps & Rubella (MMR II)

Muscle twitching has been reported 589 times in association with Measles, Mumps & Rubella (MMR II) vaccination in VAERS. This represents 0.7% of all 89,976 reports for this vaccine.

Among these reports, 2 mentioned death (0.34%) and 106 involved hospitalization (18.0%).

Muscle twitching is the #96 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 589 reports of Muscle twitching after Measles, Mumps & Rubella (MMR II) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.34%, suggesting most cases are non-fatal.

Important Context

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

Gaze palsy612 reportsHerpes zoster610 reportsInjection site urticaria583 reportsScreaming576 reports

Quick Facts

Reports:589
Deaths:2
Hospitalizations:106
% of Vaccine:0.7%
Rank:#96 of 2292

Related Pages

Measles, Mumps & Rubella (MMR II) OverviewMuscle twitching (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.