I get a quick hot flash on bottom of right foot. many times a day lasting for just seconds. any ideas?

This may be a : Sign of neuropathy, .

Nueritis: If you stand up a lot and/or wear high healed or flat shoes a lot, there is added pressure on the nerves of your feet. At times they swell or get entrapped and then you get sharp shooting, burning pain. If you're diabetic this could be neuropathy. Either way please see a podiatrist for further evaluation.