If you ever see someone with one or both legs that look much larger than what you’d expect, often times discolored (red splotches or bruising), that’s from blood pooling in their leg(s). Wearing compression socks/stockings pulls everything in tighter which forces the areas that blood travels through to be smaller and therefor raise it’s pressure and helps it return to the heart.
Said another way, if you compress your legs really tightly, blood can’t pool down there. Think of it like filing a water balloon. If you try to fill a water balloon while squeezing it, eventually the water is going to come back out the top.
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