From an article on the PatientWorthy.com website

Widely used as a cancer therapy and to help relieve pain from autoimmune diseases, radon therapy is gaining popularity, especially for people looking for a ankylosing spondylitis (AS) treatment.

Pam Alvarez, featured on Radonmine.com, swears by the radon mines in Boulder, MT for her ankylosing spondylitis treatment. She says, “My second 10 day stay was October 2006.  I’m now at home doing what I love to do instead of in a doctor’s office thinking about my aches and pains.”