Blood goes down to your feet all the time, but the muscles movement prevents it from just sitting around in your feet. During a flight, because you sit around for many hours, the blood just stays in your feet, resulting in there swelling up.
Pregnancy may cause your feet to swell.
No; chlamydia will notcause your legs and feet to swell.
Your feet swell
the atoms inside your feet get bigger in heat
Yes
yes
Because of all of the pressure that you put into it
Malnutrition would affect your whole body, not just your feet.
From 28,000 to 33,000 feet.
it is 5000 feet long
36,000 feet
no, but they can swell. It's called "edema"