Why do my feet and ankles start paining when I keep standing continuously for ten minutes or more? My BP varies from 130/90 to 140/90. Most of the time it's 130/90. Recently I am observing that my ankles are swelling if I sit for half an hour, without pain, but I experience pinching in the feet. I do exercise for 45 minutes daily in the morning. I am not taking any drugs right now. Why is this happening?