The singer was forced to pull out of the Nottingham show after doctors put her on vocal rest.
Thirlwall took to Instagram to make the announcement.
"I’m sorry to say Nottingham fans that my voice has completely gone as I have a throat infection...so the girls and I are going to need your help tonight! #GloryDaysTourNottingham#UrsulaStoleMyVoice#YesThisIsMyRealFrown" she wrote.
GET WELL SOON JADE!