Can walking all day cause dvt? on saturday (today is tuesday) i was up and down and walking to the point my feet started hurting and feeling heavy. then i felt a pain shoot down the side of my left leg. tuesday i still feel pain in the area?

First, DVT is usually painless. Second, sedentary, not activity or walking a lot, is a risk factor for DVT. So the pain you have could be a strained muscle or radiculopathy, not due to DVT. Your symptom should ease the next day, I expect.

DVT is from no activity of feet such as a 10 or more hour airplane flight or sitting for hours with out moving. The blood doesn't circulate and leads to clotting. The walking you did tired your limbs and the pain could be from your hip. Take a hot bath and soak feet and walk with sneakers or support hose.