yes, usually salt and poor circulation affects both feet.
but you could have some bad veins possibly in one foot causing swelling.
a doppler ultrasound of that foot could check for edema or vascular stenosis or poor circulation in one foot.
do get your cholesterol levels checked still. sometimes cholestrol can cause plaques in peripheral arteries which can cause stenosis or narrowing of blood vessels which can cause poor circulation.
keep eating healthy and exercising.
elevation of the foot when you are sitting down could help drain out some fluid.
compression stockings on that foot could help squeeze out excessive fluid.
let me know if you have other questions.
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