One Direction should have gone on stage to explain why they were cancelling a show, fans have said.
Harry Styles said the boyband was "very sorry" for calling off Tuesday's show.
Excited teenagers and their mothers queued early at the SSE Arena in Belfast for tonight's gig.
Leah McDonald, 15, from Belfast, claimed last night's ticket holders had been treated unfairly.
"They could have come on stage themselves and cancelled it. They should have let fans know earlier than they did."
She bought her tickets last Christmas but had been concerned tonight's performance would also be scrapped.
"It was obviously very upsetting for fans, we were worried that this would be cancelled as well."
Olivia Rice, also aged 15, from Armagh, said the uncertainty had not ruined the excitement.
She learned about last night's no-show through Facebook.
"I thought it was a joke and went on Twitter and saw it was not a joke and saw a video of the man talking on stage so I thought tonight would be cancelled as well."
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
SSE Arena staff hand out water to the waiting fans.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Left to right. Fans José Delhez and Shelley Kerssens from Holland pictured at the SSE Arena.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Left to right. Fans Niamh O'Neill and Maeve Devlin
pictured at the SSE Arena.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Jessika Douglas, who traveled from Australia for last night's cancelled gig, pictured outside the SSE Arena.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Left to tight. Rebecca Millar, Julia Leslie, Sasha Larkin and Katie McNeilly.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Left to right. Fans Niamh O'Neill and Maeve Devlin
pictured at the SSE Arena.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
SSE Arena staff hand out water to the waiting fans.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
One Direction cancel Belfast gig: Pictured is Corinne Davison with Lynesy Davison from Carryduff at the scene at the SSE arena in Belfast. Photo: Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
SSE Energisers along with 1D fans prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans Cara Hannon, Michaela Gallagher, Hannah O'Donnell and Amy McGreevy prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans Marion Monteiro, Krouza Chalaris and Mathilde Gaillot prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans from Lisburn prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans Nikki Leendertsen,
Chloe Zielinski, Manon Leyssen prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans Sylvana Ten Caat,
Myan Whyatt and Loarena Whyatt prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans Alana Crowe, Sarah Moore and Aimww Tweed from Portstwart pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans (L-R) Jodie McInally (Belfast) Marie Hafele(Austria)Anna Schekulin(Austria)Megan Cooling(Londonderry) Amy Bond(Londonderry) and Emma Simpson(Londonderry) pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans (L-R) Leah Wortley, Carrie Wright and Niamh Marsden from Portadown pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
One Direction's current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans Emma and Maria Kearney from Newry pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
One Direction's fans (L-R) Nikki Leendertsen(Holland) Sabrina Groothuesheidkamp(Holland) Myan and Lorena Whyatt from (Israel) pictured outside the SSE Arena in Belfast for the first of 3 concerts. Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
SSE Energiser Jennifer Evans along with 1D fans
Emma Armstrong, Lauren McClatchey and Hannah Monaghan prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energiser Lee Waring along with 1D fans Sarah Emerson and Louise Stafford prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energiser Rebecca Ferris along with 1D fans
Jess Wilson and Amy Wright prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
SSE Energisers along with 1D fans prepare to electrify the SSE Arena, Belfast this afternoon ahead of tonight's concert. Picture by Kelvin Boyes / Press Eye.
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
PACEMAKER BELFAST 20/10/2015
One DirectionÕs current On The Road Again world tour hits Belfast. Harry Styles, Liam Payne, Louis Tomlinson and MullingarÕs own Niall Horan will take to the stage at the SSE Arena in Belfast from Tuesday 20 Ð Thursday 22 October 2015. Fans Emma Kearney from Newry pictured outside the SSE Arena in Belfast for the first of 3 concerts tonight.
Picture By: Pacemaker Press
Press Eye - Belfast - Northern Ireland - 21st October 2015
One Direction fans queue up at the SSE Arena in Belfast ahead of tonight's concert. The boy band, who are playing three nights in Belfast, cancelled last nights gig at the last minute. The group made an announcement around lunch time to say they were going ahead with the rest of the shows and are rescheduling the canceled performance to Friday night.
Emotional fans after they hear the announcments that the rest of the shows are going ahead.
Picture by Jonathan Porter/PressEye
Pauline Ward, from Ballinamallard in Co Fermanagh in Northern Ireland's west, brought her daughter and said they were regular attenders at One Direction concerts.
"I just like their energy and songs and music, they seem lovely boys."
She said rumours had circulated about the reasons for the cancellation and she had also feared the worst for tonight's gig.
"It was a long time before we found out if we were going to go tonight. I was sitting at work on tenterhooks, it was a bit annoying, how long does it take to make a decision that the concerts are going ahead?"
She said she was disappointed for ticket holders last night.
"Hearing of other families who have travelled from Holland, France, places like that, that have lost all that money, that have cost all that money, the expense of driving up, it is terrible."
I'm so sorry to everybody I disappointed last night. I'm feeling better now. I really hope everyone can make the rescheduled date on Friday.
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott
Picture - Kevin Scott Tuesday 20th October 2015 - Belfast Northern Ireland- 1direction cancelled Pictured is the scene at the SSE arena in Belfast where 1 direction have cancelled their nights concert following a sudden illness by Liam Payne Picture - Kevin Scott