In my case I don't think it's HRT because I've been on that for a couple of years now, and this foot problem has only presented itself in about the last 6 months. I do need to lose some weight, so I'm wondering if that could be part of the problem. It's not overly debilitating though. I can still go walking most mornings without too many problems. The main problem for me is when I start walking after sitting for a while.
When the pain was in my left ankle I told the doctor and she didn't seem that interested, so I haven't mentioned the switch over to my right foot yet. Hopefully it might just disappear one day, like it did in my left foot.