I was diagnosed with acute arthritis in my foot/ankle by my GP. He prescribed Celebrex, 200 mg once a day. And, he referred me to a rheumatologist which I cannot get in to see for over a month. I need to know if walking for 45 minutes on a treadmill will do permanent damage if I cannot see the doctor before August. I have always exercised, I am 64 years old, and have had 5 abdominal obstructions requiring surgery and loss of significant parts of my colon and small intestines. I was on intravenous feeding for 4 months in 2013 after my last obstruction and surgery.