In his statement he says-
"Two and a half months ago, just before a show in Dallas, I lost most of my hearing," he writes. "Although I can still hear a little, one on one and on the phone, I can't hear music well enough to sing. The lower frequencies distort violently making it impossible to find pitch... The doctors believe I have Meniere's Disease and have agreed that I can't perform until I improve."
Read the full statement below.