I've been having this brief "hot" sensation in my foot for the past few weeks. It will only last for a few seconds and then go away. It scares me. My skin is never hot to the touch externally, it just feels hot internally. I don't have any other health problems that I'm aware of like diabetes or anything. It's only unilateral, not in both feet. It is near the arch of my left foot, on the inside of the arch kind of. I will notice it maybe 5 - 10 times per day.
EDIT:* I have anxiety issues and sometimes I wonder if it is related to my anxiety.