Independent · International · Evidence-based

Did your health change following a COVID-19 vaccination?

Your experience deserves to be documented.

VAX-SIN is building an independent international database of personal reports and research to help identify patterns, improve access to information and connect people with relevant resources.

Report Your ExperienceExplore ResearchFind Support

Your story is part of the data. Report. Research. Connect the dots.

What you can do

Something happened. Here is where to start.

01

Report

Document what happened and when.

Report your experience
02

Research

Search studies and information by symptom or condition.

Open the Research Library
03

Understand

Explore related reports and published research.

Search by symptom
04

Find Support

Connect with relevant professional and legal resources.

Find support
Find your symptom

What are you experiencing?

Search by symptom or reported medical condition. Each category separates personal reports, published research and general medical information.

CardiovascularChest pain, palpitations, myocarditis NeurologicalNumbness, tingling, facial palsy FatiguePersistent exhaustion, brain fog PainJoint, muscle and nerve pain DermatologicalRashes, hives, skin changes VisionBlurred vision, eye inflammation HearingTinnitus, hearing changes Menstrual & HormonalCycle changes, bleeding ImmuneAllergic and autoimmune reactions CoagulationClots, bruising, low platelets AutonomicDizziness on standing, heart rate OtherAnything not listed above
Global Case Database

Every report adds another piece to the picture.

Reports are structured so that patterns can be examined — carefully, anonymously and with the data's limits made clear.

The database is opening for reports now. Live counts will appear here only once they are verified — VAX-SIN does not publish numbers the data cannot support.

Reports can be categorized by:

  • Age
  • Sex
  • Country
  • Vaccine type
  • Dose number
  • Time to symptom onset
  • Symptom / diagnosis
  • Duration
  • Treatment
  • Current status
Add your reportHow the database works
Research Library · Latest additions

Research Library

Explore published research relating to reported health events following COVID-19 vaccination. Every study is shown with its source, design, size and limitations.

✓ Peer reviewedMultinational observed-vs-expected cohortMultiple systems

COVID-19 vaccines and adverse events of special interest: A multinational Global Vaccine Data Network (GVDN) cohort study of 99 million vaccinated individuals

Faksova K, Walsh D, Jiang Y, et al. · Vaccine 42(9):2200–2211 · 2024

Participants / data
About 99 million vaccinated individuals across data sites in 8 countries.
Key finding
Confirmed previously identified safety signals — including myocarditis and pericarditis after mRNA vaccines, and Guillain-Barré syndrome and cerebral venous sinus thrombosis after the ChAdOx1 vaccine — and highlighted other potential signals for further investigation.
Limitations
Observed-vs-expected comparisons depend on background rates; a signal is a prompt for investigation, not proof of causation.
Original source · DOI 10.1016/j.vaccine.2024.01.100
Preprint — not peer reviewedExploratory immunology studyImmune · fatigue · autonomic

Immunological and Antigenic Signatures Associated with Chronic Illnesses after COVID-19 Vaccination

Bhattacharjee B, Lu P, Monteiro VS, et al. · medRxiv (preprint) · 2025

Participants / data
42 people reporting post-vaccination syndrome and 22 healthy controls (Yale LISTEN study).
Key finding
Reported differences in immune cell populations, more frequent signs of Epstein-Barr virus reactivation, and elevated circulating spike protein in some participants with post-vaccination syndrome compared with controls.
Limitations
Not peer reviewed; small sample; the authors describe the findings as preliminary; cannot establish causation.
Original source · DOI 10.1101/2025.02.18.25322379
✓ Peer reviewedMatched observational cohortCardiovascular · Israel

Safety of the BNT162b2 mRNA Covid-19 Vaccine in a Nationwide Setting

Barda N, Dagan N, Ben-Shlomo Y, et al. · New England Journal of Medicine 385:1078–1090 · 2021

Participants / data
884,828 vaccinated people matched to 884,828 unvaccinated people (Clalit Health Services, Israel).
Key finding
Vaccination was associated with an elevated risk of myocarditis (risk ratio 3.24; about 2.7 excess events per 100,000 people), as well as lymphadenopathy, appendicitis and herpes zoster. SARS-CoV-2 infection itself was associated with a substantially higher risk of myocarditis and several other serious events.
Limitations
Observational design; 42-day follow-up window; one health organization; wide confidence intervals for rare events.
Original source · DOI 10.1056/NEJMoa2110475
See all studies
Personal stories

Behind every data point is a person.

Personal accounts from people describing their health experience, diagnosis, treatments and journey.

Personal stories are published only with the writer's explicit written consent. The first accounts will appear here soon.

Share your story

This is a personal account and does not by itself establish causation.

Find professional support

What can I do next?

Depending on what you need — medical information, a professional, research or legal information.

Experts

Professional support

Information about clinicians and professionals who work with people reporting health events after vaccination.

Experts
Legal Resources

Know your options

Information about compensation schemes and lawyers who handle personal-injury and medical claims. No promised outcomes.

Legal resources
Research

Read the evidence

Peer-reviewed studies and preprints, clearly labelled, with their limitations.

Research Library
About VAX-SIN

A Global Evidence & Support Platform

Something happened to me. I want to document it. I want to understand it. I want to know whether others experienced something similar — and what I can do next.

About

Our mission

DATA, KNOWLEDGE, ACTION: why VAX-SIN exists and how it works.

About VAX-SIN
Advisory Board

Scientific & Professional Advisory Board

Advisors are listed only after their explicit written approval.

Advisory Board
Partners

Help us build the database

Researchers, physicians, data scientists, patient organizations and universities.

Become a partner
Trust Center

Why trust VAX-SIN?

Credibility before controversy. These principles apply to every page, report and study on the platform.

Independent

Independent

VAX-SIN is independent. Commercial content is kept separate from research and reports.

Source Transparency

Every source is linked

Every study links to its original source, with design, size and limitations.

Privacy First

Privacy first

You choose whether your report stays private, is used anonymously or is published.

Privacy Center
Reports ≠ Scientific Proof

Reports are not proof

A personal report is valuable evidence of experience — not proof of causation. We keep the two clearly apart.

No Medical Diagnosis

No diagnosis

VAX-SIN does not diagnose, and does not tell anyone what caused their condition.

Not a Substitute for Medical Care

Not a substitute for care

Always consult a qualified healthcare professional before any medical decision.

Transparency & Methodology