icicle sensation in groin

My mother has the sensation of "icicles running thru veins" in her groin area. It comes and goes. There is no associated pain. She has no known heart or circulatory issues. She has chronic bursitus in one hip. She's had one episode of sciatica a few years ago.

Her meds are:
otc vitamins
thyroid meds
lowest dose premarin 3x weekly
pain med (as needed) for bursitus

Is the sensation a blood flow issue? Or, is it more of a nerve issue?
Is this an indicator of anything significant?

thanks for providing such a great resource here --

kim