: What is the name of the condition where your foot is much larger when standing than when sitting? What is the name of the condition where your foot is much larger when standing than when sitting?

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Where the tissues swell when you do a lot of standing but don't when you're recumbent, or less obvious when you're sitting - is called dependent edema.

What are the causes for dependent edema?
Although dependent edema is the most common cause for leg swelling, there is no easy explanation to why it happens. All that is known that it happens in certain conditions Here are several causes that are known to be causes of leg swelling:

Hot weather – Hot weather causes the veins to dilate. Dilated veins
will result in fluid leaving them. This is a very common cause of
ankle swelling. This is why more people complain of swollen legs
during summer.
Flight – The pressure in the passanger cabin during
flight is less than it is on the ground. That reduced pressure may
cause the ankles to swell.
Diet rich in salt – Salt is well known to
attract fluid. A diet rich in salt may result in dependent edema (editor: Hmm. that needs a reference)
Standing for a long time – Gravity results in pooling of fluid in the
ankles after long periods of standing. This is why people who are on
their feet a lot without really moving get swollen legs. Examples of
such people are cashiers.
Lack of movement – The body uses movement
to pump fluid out of the legs and back into the body. People who do
not move much will develop edema. This may happen even in young,
healthy, people, who have a desk job and sit by their computer for
prolonged periods of time.
Medication – Such as amlodipine. (vasodilators)

www.angiologist.com/uniquely-vascular-medicine/dependent-edema/