Andre said that he has undergone a series of medical examinations to try to find out what is wrong with him but that doctors have yet to pinpoint the ailment.
In his New magazine column, Andre wrote: "I'm sorry to say that I haven't been feeling too great these last couple of weeks.
"I don't know what's wrong with me, but I've got some ongoing health problems, and I've been having lots of tests at the hospital. I also had an MRI scan last week, so hopefully the doctors will get to the bottom of it soon."
He added: "I just don't feel right and I'm gutted because I had to pull out of the Pride of Britain Awards because I felt so rough. It looked like a great night. Hopefully, I'll be on the mend soon though."
In 2007, Andre was struck down with meningitis and spent just over a week in hospital.