I'm 58, slightly overweight (by about 20 pounds). I've been walking "briskly" on a treadmill at home - I never run - for over a year, with no problems. I wear NB walking shoes.  A month ago, I started using the gym treadmill at my new job. It was ok until I started using the incline.  My left ankle has been hurting for a couple of weeks now. It looks slightly swollen. i've used ice and am doing the stationary bike and rowing machine instead of the treadmill, but it still hurts to walk around.  Is there anything else I should be doing? see the doctor? Give it more time? Stop all exercise for a while? I really love to walk.