American rapper and songwriter Post Malone‘s injuries after falling through a stage trap door during a concert last weekend seem to be more serious than they first appeared.

According to Variety, on Saturday evening, Malone shared on social media that he was in the hospital with “stabbing pain” and would be unable to go on as scheduled at Boston’s TD Garden.

With his next show being three days away in Cleveland, he did not say whether future dates are expected to go on as scheduled, given the fact that he was apparently still being examined.

His post began, “Boston, I love y’all so fucking much. On tour, I usually wake up around 4 o’clock p.m., and today I woke up to cracking sounds on the right side of my body. I felt so good last night, but today it feels so different than it has before. I’m having a very difficult time breathing, and there’s like a stabbing pain whenever I breathe or move. We’re in the hospital now, but with this pain, I can’t do the show tonight.”