Meat Loaf: Rep Claims Dehydration Behind Concert Collapse

Meat Loaf's scary collapse during a show in Canada Thursday was triggered by severe dehydration ... so claims a spokesperson for the singer.

The singer collapsed Thursday night during his encore performance of "I'd Do Anything For Love."

Meat Loaf was taken to a local hospital and underwent tests ... his vital signs are stable but he's still hospitalized.

It's a little weird ... Meat Loaf just cancelled a bunch of concerts because of some sort of undisclosed illness. He also just cancelled his Saturday night show in Alberta.