Showbiz journalist Dan Wootton told Daybreak that pop star Justin Bieber is "under a huge amount of pressure."
Wootton said the singer has had to deal with a "huge backlash" this week for the first time in his career.
Earlier this week Bieber turned up two hours late for a gig at the London O2 Arena.
Wootton, who has spent time with the star on tour added, "I just think it was too much for him."
Pop sensation Justin Bieber is in hospital, after he fainted during his gig at the O2 Arena last night.
Bieber's manager Scooter Braun came on stage during the performance to explain what was going on.
One fan told Daybreak "we were worried about him," she said, "but at the same time I payed really good money, and I was really disappointed he didn't come out and play the whole set."
Justin Bieber left the stage of the O2 Arena mid-song, amateur footage shows. He is currently recovering in hospital.
Warning: This footage contains flashing images
Justin Bieber is recovering in hospital after he fainted during his gig at the O2 Arena last night.
He posted a picture of himself on Instagram from his hospital bed and said he was "getting better listening to Janis Joplin."
Singer Justin Bieber was rushed off stage at the O2 during his concert, after apparently suffering from breathing problems.
In a Twitter post the Canadian pop sensation said he was "getting better."
Canadian teen pop star Justin Bieber collapsed on stage from shortness of breath during his performance at the O2 Arena last night, representatives for the singer said. Bieber's spokeswoman Melissa Victor said:
Bieber was performing for the third out of four nights at London's O2 Arena as part of the European leg of his sold-out "Believe" world tour.
Canadian pop sensation Justin Bieber rushed off stage at the O2 during his concert this evening, after apparently suffering from breathing problems.
His manager Scooter Braun came on shortly after he left the stage to explain what was happening to his thousands of worried fans, many of whom had taken to Twitter to report the star had "collapsed."
His manager said his doctors backstage asked him not to continue the show, but he insisted, and returned to the stage, much to the relief of his fans.
Although he was booed for running late, fans started cheering once Justin Bieber's performance got underway.
This video of last night's show was posted on Youtube by Hollywood Best Videos.