Left foot swollen since a 5-hour flight 2 days ago. doesn't hurt to walk, swelling does down at night, but returns in the day. should i be worried?

Might want to check : This may be just venous insufficiency or varicose vein and such. But it wouldn't hurt to have a doctor take a look to be sure. Also try wearing support hose at least knee high as well.

Concerned: I would be concerned. Mainly because of your age. Usually, the concern on long flights is someone can possibly get a clot in their leg. The concern is that normally your foot is not swollen. It is possible you have a stress fracture, though, i wold expect some degree of pain. A visit to the doc, i think would be a good idea.

Rigors of Flight.: This falls into the realm of transient intermittent foot swelling caused by you 5 hour flight with inactivity. If this was the first time that your foot became swollen, then the chances are that with a little time and activity the foot should go back to normal. As long as the swelling goes down at night, it is probably only a matter of time before all is normal. Keep a keen eye open though.