Reason #1: Your Blood Vessels Expand
Just like most things expand as they warm up, the veins in your legs widen in hot weather, which allows more fluid to leak into the surrounding tissue. Gravity makes this worse, since your feet and ankles are the lowest point of your body — which is why swelling tends to build throughout the day and is usually less noticeable first thing in the morning.
What helps: elevating your feet above heart level for short periods, even just 20 minutes at a time, can make a real difference when this is the underlying cause.
