The 74-year-old Ann announced in a July social media post that she had undergone "an operation to remove something, that, as it turns out, was cancerous." While she was feeling good, she had to undergo preventative chemotherapy, and the band postponed their tour in order for her to take the time needed to fully recover.
A complete list of dates can be found at heart-music.com.
Prior to postponing the U.S. tour, Heart had already postponed a set of European dates, but so far they have not rescheduled those shows.