At a Kings of Leon show in Dallas on Friday, lead singer Caleb Followill walked off the stage after telling the audience it was too hot to sing. His abrupt departure after a few songs was blamed on heat exhaustion and dehydration. But on Twitter, band members hinted at other problems.

"Dallas, I cannot begin to tell you how sorry I am. There are internal sicknesses & problems that have needed to be addressed. No words," Jared Followill tweeted.

In a statement, the family rock band apologized to fans. They also canceled Saturday's concert in Houston. They plan to make up both concerts in September. "The Kings of Leon apologize to their fans for the inconvenience this may have caused and look forward to seeing their fans again in September," read a statement sent by their publicist on Sunday. The band plans to return to Dallas on Sept. 21. Houston's show was rescheduled for Sept. 22.

So, apparently at the show on Friday Caleb repeatedly complained that it was too hot and that his voice was suffering because of it. He announced to the audience: "I'm gonna go backstage for a second, I'm gonna vomit, I'm gonna drink a beer and I'm gonna come back out and play three more songs." Well, he never did come back out, leaving the rest of the band to finally announce the early end of the show to a booing audience.

Now I'm a Kings of Leon fan but this is kind of pathetic. If you really were too sick or drunk or whatever to perform, then never take the stage in the first place. That still wouldn't sit right with me, but more so then taking the stage and then proclaiming that the arena was too hot for you and your voice. Think of all the legends before you who played in much worse conditions (the stories are endless).

I don't know, it seems there might be something else going on based on brother Jared's tweet. We'll keep you posted.