5:54 PM PT -- TMZ has learned … 5 Seconds of Summer has given all fans at last night’s concert a refund after it ended early due to Ashton’s medical incident.
5 Seconds of Summer fans are wondering why the band's concert came to a screeching halt Sunday night, and TMZ has learned it's because their drummer had to be rushed to the hospital.
A rep for the band tells us ... "Last night’s show ended early due to a medical incident during the show. Upon experiencing physical symptoms, Ashton [Irwin] was taken to a local hospital for tests and medical review. As a result, it was advised Ashton had experienced extreme heat exhaustion. Thankfully and most importantly, he is feeling ok and recovering very well."
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The band was 45 minutes into Sunday night's Houston concert, when someone came out on stage and told the audience they were taking a short break.