Edema is swelling caused by excess fluid trapped in your body's tissues. It’s most commonly noticed in your hands, arms, feet, ankles and legs, though it can affect any part of your body. Edema can be the result of underlying medical conditions like diabetes or arthritis, certain medications, pregnancy, shoes or socks that are too tight, and shoes and socks that are too loose and unsupportive.

When valves in the blood veins don’t close all the way, the blood pools in the feet and swelling occurs. This can result in blood veins bursting, i.e. spider veins, or enlarging into varicose veins. If the issue is ignored, it can become more serious.

Swelling or puffiness
Skin that retains a dimple after being pressed for several seconds
Rapid weight gain
Stretchy or shiny skin

from Schuler Shoes' Board Certified Pedorthist

This is not a medical diagnosis but a footwear recommendation to offer symptom relief. It is meant to supplement your doctor's treatment plan. 

A more stable and supportive shoe or insole can limit excess motion, which causes strain on the lower leg muscles. This is important because the lower leg muscles are considered to be the heart of the lower body; the action of walking and exercising causes the muscles to contract, squeezing or pumping blood up towards the heart and then on to the kidneys and liver where the blood and fluids are filtered and detoxified.

Compression socks can also help as they flex and contract with walking and aid the pumping action to help circulation.

A consultation with a certified specialist is recommended in order to come up with and implement a plan that is best suited to the individual.
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References: Mayo Clinic