It's only being referred to as a mystery illness because the family hasn't found it necessary to tell the public their business. His mother died from a serious autoimmune disorder when he was only a teenager. Then there was the plane crash he survived with 65% body burned, blood clots a couple of times since then. BTW, he's Catholic, goes to church, prays with his children and definitely believes in God (and hasn't made a secret of it.) I'm keeping a good thought for him. He's a fantastic drummer, seems a good father and stepfather and is friends with his ex. It would be awful if something happened to him as his life was just going so well.
One of the comments: