Swollen Legs And Feet

PROFESSIONAL ADVICE IS HIGHLY APPRECIATED... I realize that being seated at my desk for 3-4 hours isn t good but at my age is this normal? 35 and otherwise healthy. Not on any medications and my diet is very sodium restrictive and high in fiber. I admit that I don t drink much water perhaps 3 glasses of fluid a day. Could that be it? or is renal insufficiency possible at this age? I don t drink alcohol - perhaps a glass of wine or two bi-monthly. I do smoke about 1/2 pack of cigarettes a day... could that be causing vascular deterioration at this age? I have smoked since I was 20 so my pack history is 7.5 years. I ve started to do ankle circles but so far no real notable change... HELP? Any professional advice is appreciated....