---
description: This page describes what data you visualise in VA HUB and why.
---

# Adverse Events data

REACT requires Adverse Events data to be _**MEDdra**_ coded in the source data files

The tabs which appear in the Adverse Events view will be dependent upon the data which has been mapped into ADMIN UI

How much data is populated in each tab will be dependent upon the amount of data mapped in mandatory and non-mandatory mapping fields

Adverse Events data is complex to map, understanding what the data fields require from the source data file is critical in loading the data successfully

Understanding the source data file will help in mapping the data to the correct data fields in ADMIN UI

It is advised that the _source data file column names do not have any spaces between them_ as this can give an error when mapping the data - this is particularly important for Adverse Events data mapping
