The musician took to Twitter.com late on Tuesday night (26May15) to tell fans about his crippling chest pains, and he went to see a doctor to find out the cause.

He writes, "I think I have a broken rib. When I exhale into the harmonica my whole body wants to throw up a fireball of pain. Oh man."

Adams later posted a picture of the inside of a medical centre and added, "Let's find out if it's broken. Either way I'm playing the shows. Getting in my bunk is brutal tho (sic)."

He returned to Twitter after being examined by a doctor and confirmed he does have a broken rib. The musician is due to play his next show in Vancouver, Canada on Wednesday night (27May15) before taking his tour to the U.S.