It could be poor circulation. It could be PAD or artery blockage. I get the same pain at that time of the month so I use leg vein circulation caps. I buy at iHerb dot com. You should go see a doctor.If you don't go to doctors like so many people because doctors give you drugs that make you worse (side effects) and sicker, you can decide whether you want to try the herbal route. If you want to try something herbal go to www.iherb.com and type leg circulation or leg veins in the search box and then read customer reviews see what is similar to yours.If you decide to buy use iHerb discount coupon code HAW031 (copy/paste at checkout) for free $5 off your total, no minimum order. Good luck.