3 years ago I got pitting edema (pitting oedema) on my left foot. This is a swelling caused by the buildup of lymph fluid. I had not had surgery, or heart failure, so the only possible cause of this, that I can find, is DVT deep vein thrombosis.

But I have not been on any long haul flights. So could I have got it by sitting for hours on a chair surfing the net (scienceforums of course).

The problem is that this edema swelling makes the foot vulnerable to bacterial infection, and this put me in hospital for a week last week.

Ya... I would advise you to getup from pc every 1 hour and walk for 5 mins.. to keep your health fine...