Sodium and Swelling
Sodium also causes swelling for some. A problem with the heart or kidneys can inhibit your body's ability to expel sodium. It can build up in the tissues, bringing water with it, and cause edema (swelling).
newsletter-graphicOther things can cause bloating, such as hormones. And swelling in your legs could indicate that your heart isn't pumping blood efficiently away from them (because of a weak heart muscle or malfunctioning pacemaker function, for example).
The bottom line for people who are salt-sensitive: Make sure you're under a health-care provider's watch, who will likely tell you to moderate your salt intake.