Adele reveals the odd way she gets on stage for her shows

British pop singer Adele has revealed how she thinks inside the box when it comes to slipping on to the stage past thousands of cheering fans.

In Sydney on Saturday night, the 'Hello' hitmaker told her adoring crowd that they would laugh if they found out why she always emerges onto the stage covered in sweat on each night of her arena tour.

And now, an insider to Adele's concert tour toldThe Sun that the reason for the 28-year-old's perspiration is because she's rolled underneath the stage in an equipment box before each of her performances.

On Friday night, Adele was left crying onstage after one of her thousands of fans went into cardiac arrest and had to be taken to Westmead Hospital, where she reportedly remains.

The following night's performance, which was also played to about 95,000 at ANZ Stadium, the 'Rolling in the Deep' singer dedicated her performance of 'Take It All' to the afflicted fan.

"At this point in the show last night, there was a lady, she got really ill down there - and I sang this song with my back to what was going on," Adele told the crowd.

"I knew what was going on, but I was really scared - and it was at this point I stopped the show to check if she was okay.

"I don't know if she's okay yet, but I'd like to sing this song for her tonight."

Adele then addressed the woman personally.

"I wish you a speedy recovery. I look forward to finding out who you are - I don't know who she is yet - and I'll be speaking to you soon, I hope."

The singer arrives in New Zealand next week ahead of three sold-out shows at Auckland's Mt Smart Stadium.

Newshub.