In an Instagram post, he says: "I have had a bit of blood come out of my mouth on the last tour, that freaked me out. Also, as of yesterday, I felt physically off and my throat was feeling irritated. I looked in the mirror with a light and saw the white splotches and kind of freaked.

"I am aware white splotches usually mean an infection, but I cannot help thinking the worse when it comes to my voice - as it is super important to my life. So it contributed to an already mentally and physically off day yesterday. Turns out it is strep throat with some swollen folds."