The 'Baby' hitmaker – who angered fans when he was two hours late for his show earlier this week – informed the crowd he wasn't feeling well and got checked out by a doctor before returning 10 minutes later to finish his set.
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Following the concert, Justin's team immediately brought him to a local hospital for a full check-up.
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His representative told E! News: 'He got oxygen from emergency personnel. He insisted on finishing the show. He is on the way to the hospital right now.'
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Video footage from the concert also shows Justin's manager Scooter Braun telling his fans that the 19- year-old singer had been 'very low of breath' during the show and was being checked over by a medical team.
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Justin was recently reprimanded by his record company and warned to curb his partying ways and 'stay in more'.
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A source said: 'Being amidst a barrage of abuse is uncharted territory for Justin. Understandably he is finding it hard to take ... His antics are not what his young fans expect of him.
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After an emergency meeting in the US, Justin's people reportedly had him on Skype to bosses and he was given a serious talking-to.
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'It was suggested he start staying in more and basically cleaning up his act ... Justin took the news well and has promised to go back to putting his fans first.'
I wish him quick recovery. Maybe he needs an urgent break from anything music for now. That has to happen for him to have rest of mind