Adele's one-woman invasion of the U.S. and Canada has hit a brief snag as she has come down with laryngitis.

The British singer pulled out of a show in Salt Lake City on May 29 at short notice, before postponing gigs in Vancouver, Seattle and Portland. Her tour is set to resume in San Francisco on June 4.

Adele's website explains that she cancelled a show in Minneapolis last week after she lost her voice and failed to complete a sound check, and then struggled through a Saturday night show in Denver.