I get this mild warm rush feeling to the bottom of my feet every so often. Happens a few times a day not sure if i overthinking and it’s perfectly normal, i do suffer with health anxiety to point out. I am on my feet most days and i am a very anxious and stressed person anyway so maybe could be just a symptom of anxiety. Blood rushing around my body to areas it’s needed most i dunno. It doesn’t cause pain just a weird feeling that is hard not to notice when i feel it.