The band was set to perform in Brazil from Oct. 11-22 and apologized to fans for the cancellation in a statement posted on Instagram and Twitter.
"With deep regret, we've been forced to postpone our upcoming shows in Rio de Janeiro and São Paulo until early 2023. Due to a serious lung infection, Chris has been put under strict doctor's orders to rest for the next three weeks," the band wrote.
"We're working as fast as possible to lock in the new dates and will follow up with more information in the next few days."
The group added that they were "extremely sorry" for the cancellations. "We're so grateful for your understanding at this challenging time where we need to prioritize Chris' health," they wrote.
The band encouraged fans to "hold onto your tickets" as they will be valid for the rescheduled dates and said refunds will be available for those who are unable to make it.
"We're optimistic that Chris will return to good health after the prescribed medical break and look forward to resuming the tour soon," they wrote.
It is unclear whether or not Coldplay will be forced to postpone any other future shows. The tour is currently expected to resume Oct. 25 in Argentina.
An itinerary of their ongoing Music of the Spheres Tour is available on the official Coldplay website, which has already been updated to reflect the postponed Brazil shows.