Musician Post Malone is apologizing to fans for canceling his show Saturday in Boston.

Malone is recovering from bruised ribs after taking a nasty fall on stage last week in St. Louis.

MORE: What's Hot: Post Malone falls and bruises ribs during concert

Saturday, Malone took to social media saying he was in the hospital and that quote, "I'm having a very difficult time breathing, and there's like a stabbing pain whenever I breathe or move."

Malone said he feels terrible canceling, but that his team will reschedule the show.

Malone has concerts scheduled for the Prudential Center in Newark on Oct. 7, at UBS Arena in Elmont on Oct. 9, and two shows at Madison Square Garden on Oct. 12 and Oct. 13.