The Rolling Stones said on Saturday that Mick Jagger required medical treatment for an unspecified health problem and that the band would postpone its spring tour in the United States and Canada.

Jagger’s doctors advised him not to go on the remaining 17 shows of the tour but expected him to make a “complete recovery,” according to a statement from the band. Jagger, 75, apologized to fans.

“I really hate letting you down like this,” he said in a tweet. “I’m devastated for having to postpone the tour but I will be working very hard to be back on stage as soon as I can.”

The band, which got its start more than five decades ago, performed the first two legs of its “No Filter” tour in Europe during fall 2017 and spring 2018. The final leg of the tour was scheduled to take the band through American cities including Miami, Houston, Denver and Chicago, as well as a venue north of Toronto. The Stones were scheduled to play at New Orleans Jazz Festival in May.