The singer previously canceled shows in Phoenix, San Diego, Anaheim, Calif., and Los Angeles.

Affected dates on Lavigne’s Best Damn Tour include May 6 at the Santa Barbara Bowl and May 7 at HP Pavilion at San Jose in California and May 9 at Spokane Arena and May 10 at Comcast Arena at Everett Events Center in Washington.

Refunds are available at point of purchase.

The singer expressed her regrets about the postponement in a message to fans.

“My sincerest apologies to all of my fans,” she said. “My intention was to complete the rest of the tour, but tonight at sound check in Anaheim, I realized this wasn’t possible.

“Even though I have been resting my voice for days, when I tried to sing nothing came out.”