My grandmother is experiencing a lot of circulation problems in her feet and legs. Sometimes her feet change color, sometimes they go numb and pulse is weak at times. She has suffered from foot ulcers in the past as well.
She has had diabetes for the past twenty years and apparently, diabetes affects blood circulation a lot. In fact, poor circulation and sores on the feet are one of the symptoms doctors look for while diagnosing diabetes in the elderly.
My grandmother has to keep her feet warm all the time and she wears special diabetes socks to improve circulation in her legs. She lives with us and we also check her legs regularly for sores. If the circulation to her feet were to get cut off, she would experience tissue death and the doctors would have to do amputation. So we are regularly checking her feet and legs to make sure everything is okay.